六年级上册300道分数混合运算有答案
深泉学校-教案的格式
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×=
×÷×=
×
0×
=
+=
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
④
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
×
÷
×
÷×
=
0×
+=
(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×
+=
×=
=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×
3×
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
3×
×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×
⑤
=
=
=
××
=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)