六年级上册300道分数混合运算有答案

玛丽莲梦兔
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2020年11月29日 04:20
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深泉学校-教案的格式

2020年11月29日发(作者:戴逸)



一.计算题(共50小题)

1.计算下面各题,能简算的要写出简算过程.

12.5×32×0.25
12×[(


﹣)×3] ÷50+÷


4.78×0.25+0.522×2.5



20.15×2015﹣20.15×2014 15.12﹣(3.12+4.6)﹣5.4




2.计算.

8﹣×÷4 9.6÷3.2+5.1×4





×(÷+) 60×(﹣+)
3.直接写出得数.

8.63+3.7=

0.25×17×4=

8÷=

×2÷2×=

9.6÷0.8=

100÷1%=

10﹣0.86=

12×(+)=

2÷1%﹦

0.9×99+0.9=

4.直接写出计算结果

1%﹣0.1%=

÷÷×=

0.24×5=

×÷×=

﹣(﹣)=

48×+3÷7=

+﹣+=

+++++=


5.下面各题怎样算简便就怎样算.

14.12+2.36﹣7.36+2.88
6

÷﹣÷6




×


第1页(共39页)

(+﹣)÷


﹣÷13 ﹣×


×[÷(﹣)]



6.计算下面各题打星号的要简算.

19.5×0.2﹣2.07÷23 ※(



+)×29×23

×[÷(﹣)] ※



×+÷5+.
7.正确合理地计算下面各题

29.4÷2.8×(3.5﹣2.3)



15﹣6.37﹣3.63



1.25×0.32×250

3×+7÷9×5+÷.

7﹣(2+1

)×

2×9.25+7×9





8.脱式计算(能简算的要简算,并写出主要过程)

1125﹣997




×﹣×

(+﹣)÷

109×101


(1.6+1.6+1.6+1.6)×25


[﹣(+)]×.



第2页(共39页)



9.下面各题,怎样算简便就怎样算





×

+×+

×[÷(﹣)].

(+



)÷

21÷(+)÷

×﹣÷

10.脱式计算,能简算的要简算.

①12.5×8÷12.5×8 ②12.7﹣3.6﹣5.4




③24×(+﹣) ④×[﹣(



﹣)].
11.用你喜欢的方法计算.

①3.6+2.8+7.4+7.2 ②(++


)×36
③2﹣

× ④(+)÷﹣.



12.用你喜欢的方法计算下面各题.

22.7﹣1.8+17.3﹣18.2 (+

)×8+ [﹣(﹣)]÷


第3页(共39页)



3.4×2.77+0.23×3.4 (





++)×72 +++.

13.脱式计算(能简便的要用简便方法计算)

(1)36+64×85+15 (2)0.4×9×25 (3)61×40%+38×+0.4





(4)2475÷45+2475÷55 (5)(15﹣14×)×



(6)+5.8﹣+4.2.
14.选择合适的方法计算.

×






×99+

(5.6+2.8)÷

÷[×(+)].

15.计算下面各题.

105×(++) (3618÷18﹣145)×29




﹣4.5÷(0.2+) 11.3﹣3.79+8.7﹣7.21.

16.用你喜欢的方法计算.

①22.7﹣1.8+17.3﹣18.2 ②(++

)×36 ③2﹣×

④(+)÷﹣.



第4页(共39页)



17.能用简便方法的要用简便方法.

(+×)÷



1.3×﹣0.5×25%

5.28﹣0.44﹣(2.56﹣1.72)

9.81×0.1+0.5×98.1+0.049×981.



[

﹣(﹣)]÷



+)××




18.脱式计算.

( + )×24
67

÷1.25÷0.8

68×35﹣408÷24



2.5÷×



(﹣50%)÷(×42)


(+)÷



×.

19.直接写出得数

+=

××=

10÷=

8×+8×=

÷
55×
=

÷=

a×=

×÷×=

×

=

+=

20.用递等式计算.

÷× (1﹣0.8×)÷


48048÷12+88 9÷(﹣)×3.





21.能简便计算的要用简便方法计算.

﹣(+) +++

3﹣﹣

+++.

第5页(共39页)



22.计算下面各题,能够简算的要简算.

×21×




(﹣ )×12 ×2+×2 16×25%+16×.

23.直接写出得数.

1.25×1.5×8=

6.5﹣6.5×0=

24.直接写出得数.

+=

÷=

×+=

5﹣5×=

2×3
2
=

60%×=

2.5×4%=

×(﹣0.625)=

100﹣99%=

3×÷3×=

0.55÷5.5=

0.2+8=

×=

÷=

25.计算下面各题,能简算的要简算.

(15﹣14×)×


101× ×﹣÷.





26.计算,能简便的要简便计算

×+



÷6 ÷+÷ ×+×

(+﹣)×24



÷5+5÷

56×.

27.直接写得数

×16= 12÷= 0×+=


第6页(共39页)

×÷×= +﹣+ = 28×( +)=



28.计算

(1+0÷)÷




+8+

×.

29.能简算的要简算.

+++

8.8×1.25

45×21﹣50×2.1

0.25+



++

++





﹣(﹣)

1.25×0.4×80×2.5

0.54×1.75+82.5×0.054.

30.计算下面各题,能用简便算法的要用简便算法.

(1)×÷ (2)8.6﹣÷×

( 3)÷+×

(4)20÷〔(+)×〕




31.计算下面各题.

39××

﹣+

×+





1÷(÷) (


﹣)×24 ÷[(﹣)÷].

32.

第7页(共39页)



直接写出得数.

×0×6=

6÷26=

5﹣=

+×2=

×÷×=

9π=

50%﹣0.05=

÷20%=

2+30%=

1.2:6=

33.下面各题怎样简便就怎样算.

3.7×99+3.7 105×(+) 5.37﹣1.47﹣2.53





+×﹣ +×+




34.计算下面各题,能简算的要简算

﹣(+)

++

+﹣




6﹣(﹣)

﹣++

﹣(﹣)


35.

直接写出得数.

×12=

﹣=

0.4×20%=

:=

0.5
3
=

÷=

36.下面各题,怎样算简便就怎么算

÷15×

÷(﹣)×





第8页(共39页)


×18﹣.

﹣﹣


+﹣+.


1÷×=

×3÷×3=


×+÷8.




37.能简算的要简算.

3.73++6.27+

﹣(+) +++

4﹣



38.脱式计算(写出必要的计算过程,能简算的要简算)

(1)

(2)

(3)




(4)

(5)

(6).



39.计算下面各题,能简算的要简算

1﹣÷﹣

3+×÷

÷(﹣)×




[1÷(+)]

×+÷

++.




40.计算(写出计算过程)

+﹣

1﹣( +) ×

÷6. 32×.





41.脱式计算

第9页(共39页)

﹣.

÷.




(﹣)×24 15÷15× 2÷(+)




42.直接写得数.

1÷=

÷=

÷2=

9÷=

×4=

×3=

﹣×=

×=

43.脱式计算







+﹣

(1﹣(+) 5.4÷[2.5×(3.7﹣2.9)].

44.用递等式计算.

①6.3×1.5+1.5÷0.75 ②+÷






45.下面各题怎样简便就怎样算.

÷




③(2+)÷(2﹣) ④÷[×(+)].

×

÷×÷

×+×

×99+

(+)×32

17×





46.下面各题写出必要的计算过程

××


第10页(共39页)


×4÷

÷÷.



47.计算下面各题.

×



×

4×÷

﹣+﹣

(+)×21.

48.怎样简便就怎样算.

﹣÷






25﹣÷

×35+65÷4

(+

)÷

÷3×

(+



÷)×.
49.计算下面各题,怎样简便就怎样算

×÷



÷÷




50.计算题

(1)×


×7+×11


×99+

(+)÷


48×


(2)12×(﹣) (3)×5÷×5 (4)+÷()







第11页(共39页)




分数混合运算1

参考答案与试题解析



一.计算题(共50小题)

1.计算下面各题,能简算的要写出简算过程.

12.5×32×0.25

12×[(﹣)×3]

÷50+÷

20.15×2014﹣20.15×2015 1 5.12﹣(3.12+4.6)﹣5.4 4 .78×0.25+0.522×2.5

【解答】解:(1)12.5×32×0.25

=12.5×(4×8)×0.25

=(12.5×8)×(4×0.25)

=100×1

=100;



(2)12×[(
=12×
=66﹣24

=42
﹣)×3]

×3﹣12××3]

(3)
=
=
=(
=1×
=;

×
×
+

÷50+
+
+
×
×
)×
÷





(4)20.15×2014﹣20.15×2015

=20.15×(2014﹣2015)

=20.15×(﹣1)

=﹣20.15;


(5)15.12﹣(3.12+4.6)﹣5.4

=15.12﹣3.12﹣4.6﹣5.4

=(15.12﹣3.12)﹣(4.6+5.4)

=12﹣10

=2;


(6)4.78×0.25+0.522×2.5

=4.78×0.25+5.22×0.25

=(4.78+5.22)×0.25

=10×0.25

=2.5.



2.计算.

第12页(共39页)



8﹣×÷4 9.6÷3.2+5.1×4
60×(﹣+)

【解答】解:(1)8﹣×÷4

=8﹣÷4

=8﹣
=7



×(÷+)
(2)9.6÷3.2+5.1×4

=3+20.4

=23.4;



(3)×(
=×(+)


=;



÷+)

(4)60×(﹣+)

=60×﹣60×+60×

=45﹣40+24

=5+24

=29
3.直接写出得数.

8.63+3.7=

0.25×17×4=

8÷=

9.6÷0.8=

10﹣0.86=

2÷1%﹦

×2÷2×=

100÷1%=

12×(+)=

0.9×99+0.9=

【解答】解:

8.63+3.7=12.33

0.25×17×4=17

9.6÷0.8=12

8÷=10



4.直接写出计算结果

1%﹣0.1%=

÷÷×=

【解答】解:

1%﹣0.1%=0.9%

0.24×5=1.2

﹣(﹣)=

+﹣+=

0.24×5=

﹣(﹣)=

+﹣+=

+++++=

10﹣0.86=9.14

2÷1%﹦200

×2÷2×=

100÷1%=10000

12×(+)=5

0.9×99+0.9=90

×÷×=

48×+3÷7=

第13页(共39页)



÷÷×=


×÷×=

48×+3÷7=21

+++++=

5.下面各题怎样算简便就怎样算.

14.12+2.36﹣7.36+2.88
6

÷﹣÷6 (

+﹣)÷
×

﹣÷13 ﹣× ×[÷(﹣)]

(2)6÷﹣÷6

【解答】解:(1)14.12+2.36﹣7.36+2.88

=(14.12+2.88)﹣(7.36﹣2.36)

=17﹣5

=12;


(3)(+﹣)÷

=(+﹣)×12

=×12+×12﹣×12

=3+2﹣4

=1;

(4)×﹣÷13


(5)﹣×

=﹣

=;

=4.

6.计算下面各题打星号的要简算.

19.5×0.2﹣2.07÷23
×[÷(﹣)]

※(+)×29×23

【解答】解:①19.5×0.2﹣2.07÷23


=10﹣

=9;
=×﹣×

=(﹣)×



=;
(6)×[÷(﹣)]

=×[÷]





※×+÷5+.

=3.9﹣0.09

第14页(共39页)



=3.81



②×[÷(﹣)]

=×[]

=×[×12]



=×[÷(

)]

=4
=×+×

③(
=
+)×29×23

×29×23

=(
=2×

=

+1)×

×29×23+
=46+87

=133




7.正确合理地计算下面各题

29.4÷2.8×(3.5﹣2.3)

15﹣6.37﹣3.63

1.25×0.32×250

【解答】解:(1)29.4÷2.8×(3.5﹣2.3)

=29.4÷2.8×1.2

=10.5×1.2

=12.6;

×+÷5+

7﹣(2+1)×

2×9.25+7×9

3×+7÷9×5+÷.

(2)7﹣(2+1
=7﹣3
=7﹣2

=5;

×

)×

(3)15﹣6.37﹣3.63

=15﹣(6.37+3.63)

=15﹣10

=5;

(4)2×9.25+7×9

=2×9.25+7×9.25

=(2+7)×9.25

=10×9.25

=92.5
第15页(共39页)



(5)1.25×0.32×250

=1.25×(0.4×0.8)×250

=(1.25×0.8)×(0.4×250)

=1×100

=100;

(6)3×+7÷9×5+÷


=3×+×5+

=(3+5+1)×

=9×

=7.
8.脱式计算(能简算的要简算,并写出主要过程)

1125﹣997

×
109×101

)÷
(1.6+1.6+1.6+1.6)×25


[﹣(+)]×.

﹣×

(+﹣
解:(1)1125﹣997

=1125﹣(1000﹣3)

=1125﹣1000+3

=125+3

=128;

(3)(1.6+1.6+1.6+1.6)×25

=(1.6×4)×25

=1.6×(4×25)

=1.6×100

=160;

(4)×﹣×

)÷

(2)109×101

=109×(100+1)

=109×100+109×1

=10900+109

=11009;

=
=(
×﹣×

﹣)×



=;
(5)(+﹣
=(+﹣
(6)[﹣(+)]×


)×36

×36

=×36+×36﹣
=16+30﹣14

=46﹣14

=32;


=[﹣
=
=


×





第16页(共39页)


9.下面各题,怎样算简便就怎样算

﹣×

(+)÷

+×+

【解答】解:(1)﹣×

=﹣

=;

(2)(+)÷

(3)+×+

=++

=+(+)

=+1

=1;

(5)×﹣÷

=×﹣×

=×(﹣)

=×1

=;


10.脱式计算,能简算的要简算.

①12.5×8÷12.5×8

②12.7﹣3.6﹣5.4

③24×(+﹣)

【解答】解:①12.5×8÷12.5×8



21÷(+)÷

×﹣÷

×[÷(﹣)].



=;


(4)21÷(+)÷

=21÷÷

=21÷(×)

=21÷

=35
(6)×[÷(﹣)]
=×[÷]



=.
④×[﹣(﹣)].
=(12.5÷12.5)×(8×8)
第17页(共39页 )




=1×64

=64;

②12.7﹣3.6﹣5.4

③24×(+﹣)

=24×+24×﹣24×

=6+20﹣21

=26﹣21

=5;


=12.7﹣(3.6+5.4)

=12.7﹣9

=3.7;< br>=×[﹣
=×[+﹣
=×[1﹣

=
﹣)]


+]

]

]

④×[﹣(

11.用你喜欢的方法计算.

①3.6+2.8+7.4+7.2

②(++)×36

③2﹣×



×36

④(+)÷﹣
【解答】解:①3.6+2.8+7.4+7.2

=(3.6+7.4)+(2.8+7.2)

=11+10

=21;

②(++
③2﹣
=2﹣
=1.7;

④(+)÷﹣


=×36+×36+
=9+6+15

=15+15

=30;
)×36


×=÷﹣
=
=



12.用你喜欢的方法计算下面各题.

22.7﹣1.8+17.3﹣18.2

(+)×8+


3.4×2.77+0.23×3.4

(++)×72

[﹣(﹣)]÷

+++.

第18页(共39页)



【解答】解:(1)22.7﹣1.8+17.3﹣18.2

=(22.7+17.3)﹣(1.8+18.2)

=40﹣20

=20;

(2)(+
=(×8+
)×8+
×8)+



=3+
=3+(
=3+1

=4
+
+



(3)[﹣(﹣)]÷
=[﹣





(4)3.4×2.77+0.23×3.4

=3.4×(2.77+0.23)

=3.4×3

=10.2;


=;


(5)(
=
++)×72

(6)+++

=(+)+(+)

=1+1

=2
×72+×72+×72

=30+8+27

=65;

13.脱式计算(能简便的要用简便方法计算)

(1)36+64×85+15

(2)0.4×9×25

(3)61×40%+38×+0.4

(4)2475÷45+2475÷55

【解答】解:(1)36+64×85+15

=36+5440+15

=5476+15

=5491;

(2)0.4×9×25

(3)61×40%+38×+0.4

(5)(15﹣14×)×
(6)+5.8﹣+4.2.



=0.4×25×9

=10×9

=90;


=61×0.4+38×0.4+0.4

第19页(共39页)


=(61+38+1)×0.4

=100×0.4

=40;


(5)(15﹣14×)×

=(15﹣8)×

=7×

=;

14.选择合适的方法计算.

×+÷

×99+

【解答】解:(1)×+÷

=+

=;


(2)×99+

(3)(5.6+2.8)÷

=8.4÷

=28;


(4)÷[×(+)]

15.计算下面各题.

105×(++)

(3618÷18﹣145)×29

【解答】解:(1)105×(++)


(4)2475÷45+2475÷55

=55+45

=100;



(6)+5.8﹣+4.2

=(﹣)+(5.8+4.2)

=1+10

=11.
(5.6+2.8)÷

÷[×(+)].

=×(99+1)

=×100

=16;


=÷[×]



=.



﹣4.5÷(0.2+)

11.3﹣3.79+8.7﹣7.21.

=105×+105×+105×

第20页(共39页)



=15+70+42

=127;


=(201﹣145)×29

=56×29

=1624;



(2)(3618÷18﹣145)×29

(3)
=
﹣4.5÷(0.2+)

﹣4.5÷0.5

(4)11.3﹣3.79+8.7﹣7.21

=(11.3+8.7)﹣(3.79+7.21)

=10.25﹣9

=1.25;



16.用你喜欢的方法计算.

①22.7﹣1.8+17.3﹣18.2

②(++)×36

③2﹣×

=20﹣11

=9.

④(+)÷﹣.

×36

【解答】解:①22.7﹣1.8+17.3﹣18.2

=(22.7+17.3)﹣(1.8+18.2)

=40﹣20

=20

②(++
③2﹣
=2﹣
=1



=×36+×36+
=9+6+15

=30


)×36


×=÷﹣
=
=







④(+)÷﹣
17.能用简便方法的要用简便方法.

(+×)÷

[﹣(﹣)]÷

(+)××

1.3×﹣0.5×25%

5.28﹣0.44﹣(2.56﹣1.72)

9.81×0.1+0.5×98.1+0.049×981.

【解答】解:(1)(+×)÷

=(+
第21页(共39页)

)÷





=[1﹣]÷

﹣(﹣





=;

(2)[
=[
=[
)]÷

=



﹣+
+﹣]÷
+
×
< br>(3)(
=
=
×
+
)×

×
×< br>

=1.3×0.25﹣0.5×0.25

=(1.3﹣0.5)×0.25

=0.8×0.25

=0.2;


=4;

(4)1.3×﹣0.5×25%

(5)5.28﹣0.44﹣(2.56﹣1.72)

=5.28﹣0.44﹣2.56+1.72

=(5.28+1.72)﹣(0.44+2.56)

=7﹣3

=4;


(6)9.81×0.1+0.5×98.1+0.049×981

=9.81×0.1+5×9.81+4.9×9.81

=9.81×(0.1+5+4.9)

=9.81×10

=98.1.



18.脱式计算.

( + )×24
6

7÷1.25÷0.8

68×35﹣408÷24

×.

2.5÷×

(﹣50%)÷(×42)

(+)÷
+ )×24

=67÷1

=67;


【解答】解:(1)(
=×24+×24

=20+9

=29;


(3)68×35﹣408÷24

=2380﹣17

=2363;

第22页(共39页)
(2)67÷1.25÷0.8

=67÷(1.25×0.8)




×
=

×
8×55
+8×
=4

×
÷
×
÷×
=


+=

(4)2.5÷×

=2.5××

=4×

=7;


=40



20.用递等式计算.

÷×

(1﹣0.8×)÷

48048÷12+88

9÷(﹣)×3.

【解答】解:(1)÷×

=
×

×

(5)(﹣50%)÷(×42)

=(﹣)÷(×42)

=÷30

=



(6)(+)÷
=÷×

=2;


=74×

=37.

19.直接写出得数

+=

10
=

×
×=

8×55
+8×
=

【解答】解:

+=

(2)(1﹣0.8×)÷

=(1﹣0.6)÷

=0.4÷

÷a×=

=

×
÷
=

÷
=

×
×

+=

×=

=0.5;


÷
(3)48048÷12+88

=4004+88

=4092;


(4)9÷(﹣)×3

÷
a
=

×
=b

=

×=9÷×3

=81×3

=243.

第23页(共39页)
10÷
=25





21.能简便计算的要用简便方法计算.

﹣(+)

=1﹣
=





+++

3﹣﹣

22.计算下面各题,能够简算的要简算.

×21×

+++.

﹣(+)

(﹣ )×12

×2+×2

16×25%+16×.

【解答】解:(1)×21×
=15×
=




【解答】解:(1)
=﹣﹣

=1﹣

=;


(2)+++

=(+)+(+)

=2+1

=3;


(2)(﹣ )×12

=×12﹣×12

=9﹣4

=5

(3)3﹣
=3﹣(
=3﹣1
=1



+)



(3)×2+×2

=(+)×2

=1×2

=2





(4)+++
(4)16×25%+16×

=(1﹣)+(﹣)+(﹣)+(﹣
=1﹣+﹣+﹣+﹣



=4+4

=8



第24页(共39页)



23.直接写出得数.

1.25×1.5×100﹣99%=

8=

6.5﹣6.5×

0=

【解答】解:

1.25×1.5100
×8=15

﹣0.55
5.5=0.1

÷
×
=

0.55
5.5=

÷3×
0.2+8=

÷
=

÷=

×
(15﹣14×)×
101×



×﹣÷.

【解答】解:①
=
=;




99%=99.01

=

÷
=

②(15﹣14×)×
=(15﹣8)×
=
=;




6.5﹣6.5

×0=6.5



=

÷3×

0.2+8=8.2

24.直接写出得数.

+=

2
×
2×3=

2.5×4%=


③101×
+=





=(100+1)×
÷
5﹣5×60%×
=

=

=

×(
0.625)=

=
【解答】解:

+=



=
×
2
+=

3
2
=18

×2.5×4%=0.1

=



④×﹣÷

÷
5﹣5×60%×
=5



25.计算下面各题,能简算的要简算.



=4

=

×(﹣
=
0.625)=0

=(
=2×

=.



第25页(共39页)

)×


26.计算,能简便的要简便计算

×+÷6

÷+÷

×+×

(+﹣)×24

÷5+5÷

56×.

【解答】解:(1)×+÷6
=×+×

=(+)×

=1×

=;


(2)÷+÷

=+×4

=

=;


(3)×+×

=(+)×

=1×

=;


(4)(+﹣)×24



=×24+×24﹣×24

=16+4﹣3

=17;


(5)÷5+5÷

=×+5×

=+9

=9;


(6)56×

=(57﹣1)×

=57×﹣

=17﹣

=16.



27.直接写得数

×16=

12÷=

0×+=

×÷×=

+﹣+

28×( +)=

【解答】解:×16=12

12÷=20

第26页(共39页)



0×+=

×÷×=

+﹣+=

28×(


28.计算

(1+0÷)÷

+8+

×.

【解答】解:(1)(1+0÷)÷

=(1+0)÷

=1÷

=;



2.1

++﹣

﹣)

【解答】解:(1)
=(
=1+

=1;



1.25
0.54×
××0.41.75+82.5
×800.054.

×2.5


+)=19

+++
+)+(+)

(2)8.8×1.25

=(8+0.8)×1.25

=8×1.25+0.8×1.25

=10+1

=11;


(2)+8+

=++8

=1+8

=9;


(3)45×21﹣50×2.1

=45×21﹣5×21

=(45﹣5)×21

=40×21

=840;


(4)0.25+
×=.

++
+

(3)


=(0.25+)+(
=1+1

45×
0.25+
21﹣
50×
++



29.能简算的要简算.

+++

8.8×
=2;


1.25

(5)
第27页(共39页)
++﹣



=(
=1+

+)+(﹣)

=;


=1;

(6)﹣(
=﹣
=+﹣
=1﹣
=;


(2)8.6﹣÷
﹣)

=8.6﹣2×

=8.6﹣1.2

=7.4;



×

+

(3)
=
=(
÷+
×

×

×+
+
(7)1.25×0.4×80×2.5

=(1.25×80)×(0.4×2.5)

=100×1

=100;


)×

=1×

=;


(8)0.54×1.75+82.5×0.054

=0.54×1.75+8.25×0.54

=0.54×(1.75+8.25)

=0.54×10

=5.4.

30.计算下面各题,能用简便算法的要用简便算
法.

(1)×÷

×

×



÷

(4)20÷[(+)×
=20÷[
=20÷

=80.



31.计算下面各题.

39××
﹣+
×]

]




(2)8.6﹣÷
(3)÷+×+

1÷(÷)

(﹣)×24

(4)20÷〔(+)×
【解答】解:(1)
=

×
÷

÷[(﹣)÷].

第28页(共39页)



【解答】解:(1)39××

32.

直接写
5﹣=

+×÷
9π=

=39××

=6×

=;

(2)﹣+

=+

=;

(3)×+

=+

=;

(4)1÷(÷)

=1÷

=;


(5)(﹣)×24

=×24﹣×24

=10﹣4

=6;


(6)÷[(﹣)÷]

=÷[÷]



=.




出得数.

×2=

×=

×0×
6=

6÷26=

50%﹣
÷
2+30%=

0.05=

20%=

【解答】解:

×0
5﹣
+×÷
×6=0

=4

×
×
2=

=

6÷50%﹣
÷
2+30%=2.
26=0.05=0.4
20%=
3


5

4



33.下面各题怎样简便就怎样算.

3.7×99+3.7

105×(+)

5.37﹣1.47﹣2.53

+×﹣

+×+

×18﹣.

【解答】解:(1)3.7×99+3.7

=3.7×(99+1)

=3.7×100

=370;


第29页(共39页)
1.2:
6=

9π=28.2
6

1.2:
6=0.2



(2)105×(+)

=105×+105×

=35+21

=56;

(3)5.37﹣1.47﹣2.53

=5.37﹣(1.47+2.53)

=5.37﹣4

=1.37;


(+)

6﹣(


﹣﹣
++


﹣(
﹣)

+
+.


【解答】解:(1)﹣(+)

=﹣

=



(2)+
+×﹣

=++

+

(4)
=+﹣

=1+

=﹣

=1
=;




(5)+×+

=++

=+(+)

=+1

=1;

(6)
=
=
×18﹣

(3)+﹣
=
=






(4)
=
=
=

﹣﹣

﹣(+)

﹣1



×(18﹣1)

×17

=15.



34.计算下面各题,能简算的要简算

﹣++

+﹣﹣﹣

(5)6﹣(﹣)

=6﹣
=5



第30页(共39页)



(6)﹣++

=(+)+(﹣)

=1+0

=1;

(7)﹣(﹣)

=﹣+

=0+

=;


(8)+﹣+

=(﹣)+(+)
=0+1

=1.

35.

直接写出得
×
数.

12=

0.4×20%=

:=

0.5
3
=

【解答】解:

0.4×
×12=9

20%=0.08

:=


0.5
3
=0.125




36.下面各题,怎样算简便就怎么算

÷15×

÷(﹣)×



×+÷8.

【解答】解:(1)÷15×



=;


(2)÷(﹣)×

=÷×

=÷(÷)

=÷1

=;

﹣=

1÷×=


(3)+÷

÷×3÷×
=+2

=

3=

=2;


﹣ 1÷×
(4)×+÷8

=

=1

=×+×

÷×3÷
=×(+)

=

×3=9

=×1

=.

第31页(共39页)





37.能简算的要简算.

3.73++6.27+

要简算)

(1)
(2)
(3)
(4)
(5)+6.27+








﹣(+)

+
4﹣
+

+



【解答】解:(1)3.73+
=(3.73+6.27)+(
=10+1

=11;

(2)﹣(+)

=﹣﹣

=﹣﹣

+
(6)
【解答】解:(1)
=
=







(2)
=1﹣
=﹣

=1﹣

=0;



×

=;

++

+)


(3)+
=(+)+(
=1+1

=2;

(4)4﹣
=4﹣(
=4﹣1

=3.



+



(3)
=24×+24×

=9+20



=29;


(4)
=
=(
第32页(共39页)


×+
+
×

)×

38.脱式计算(写出必要的计算过程,能简算的


=1×

=;

(5)

=÷×



=6;


(6)

=×[÷]



=.

39.计算下面各题,能简算的要简算
1﹣÷﹣

3+×÷

÷(﹣)×

[1÷(+)]

×+÷

++.

【解答】解:(1)1﹣÷﹣

=1﹣﹣

=1﹣(+)

=1﹣1

=0;




(2)3+×÷

=3+÷

=3+

=3;


(3)÷(﹣)×

=÷×



=;


(4)×[1÷(+)]

=×[1÷]



=;


(5)×+÷

=×+×

=(+)×

=1×

=;


(6)++

=++

=1+

第33页(共39页)


=1.

40.计算(写出计算过程)

+﹣

1﹣( +)

×

÷6.

32×.

÷.

【解答】解:(1)+﹣

=1﹣

=

(2)1﹣( +)

=1﹣

=

(3)×=


(4)÷6



=


(5)32×=12



(6)÷

=×25



=15



41.脱式计算

(﹣)×24

15÷15×

2÷(+)

【解答】解:(1)(﹣)×24

=×24﹣×24

=8﹣3

=5;


(2)15÷15×

=1×

=;


(3)2÷(+)

=2÷

=.



42.直接写得数.

1÷=

÷2=

×4=

﹣×=

÷=

9÷=

×3=

×=

【解答】解:

1÷=

÷×﹣×
2=

4=

=

第34页(共39页)


÷9÷=81

×3=

=



43.脱式计算

﹣﹣

+﹣

(1﹣(+)

5.4÷[2.5×(3.7﹣2.9)].

【解答】解:(1)﹣﹣

=﹣

=0


(2)+﹣

=﹣

=


(3)1﹣(+)

=1﹣

=


(4)5.4÷[2.5×(3.7﹣2.9)]

=5.4÷[2.5×0.8]

=5.4÷2

=2.7



44.用递等式计算.



×=

①6.3×1.5+1.5÷0.75

②+÷

③(2+)÷(2﹣)

④÷[×(+)].

【解答】解:①6.3×1.5+1.5÷0.75

=9.45+2

=11.45



②+÷

=+

=


③(2+)÷(2﹣)



=



④÷[×(+)]

=÷[×]



=



45.下面各题怎样简便就怎样算.

÷×

÷×÷

×+×

第35页(共39页)


×99+

(+)×32

17×.

【解答】解:(1)÷×

=××

=


(2)÷×÷

=×××

=××

=


(3)×+×

=×(+)

=×1

=


(4)×99+

=×(99+1)

=×100

=16


(5)(+)×32

=×32+×32



=24+20

=44


(6)17×

=(16+1)×

=16×+1×

=9+

=9



46.下面各题写出必要的计算过程
××

×4÷

÷÷.

【解答】解:

①××

=

=


②×4÷

=

=

=2


③÷÷

=

第36页(共39页)


=

=2



47.计算下面各题.

××

4×÷

﹣+﹣

(+)×21.

【解答】解:

①××

=


②4×÷

=4××

=3


③﹣+﹣

=()﹣()
=1﹣

=


④(+)×21

=×21+×21

=12+14

=26





48.怎样简便就怎样算.

﹣÷

×35+65÷(+)÷

4

25﹣÷÷3×

(+÷)×.


【解答】解:①﹣÷

=﹣×

=﹣

=﹣

=﹣


②×35+65÷4

=×35+65×

=(35+65)×

=100×

=

=25


③(+)÷

=÷+÷

=×+1

=+1

=

第37页(共39页)




=(7+11)×

÷
×


④25﹣
=25﹣
=25﹣10

=15


=18×

=10;


(3)×99+


=(99+1)×
÷3×

=100×


=
=
=

××

=16;

×



(4)÷÷

=××

÷)×

×)×

=1×

=;


⑥(+
=(+
=(+)×

=1×

=



49.计算下面各题,怎样简便就怎样算

×÷
÷÷


(5)(+)÷
=(+)×

=2+






×7+×11

(+)÷
×99+

48×


=3;


【解答】解:(1)×÷
=×27

=18;


(6)48×
=(47+1)×
=47×
=17+
第38页(共39 页)



+

(2)×7+×11



=17







50.计算题

(1)×

(2)12×(﹣)

(3)×5÷×5

(4)+÷()

【解答】解:(1)×

=+

=1



(2)12×(﹣)

=12×﹣12×

=4﹣3

=1


(3)×5÷×5

=÷×5×5

=1×5×5

=25



(4)+÷()

=+÷

=+5

=5


第39页(共39页)

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