六年级数学解方程100道
重阳节简报-费用管理办法
六年级解方程
100
道
一、计算题(共
20
题;共
470
分)
1.
解下列方程。
①4
+
x=8.6
②x-1.5=2.7
③0.6x=1.26
④27x+5x=128
⑤1.5+2x=11.5
⑥25+6x=79
2.
解方程
(
1
)
5x
-
2
+
1.8
=3.6
(
2
)
7
(
x
-
1
.2
)=
2.1
3.
解方程.
(
1
)
x+0.8
=
7.6
(
2
)
6.2x
﹣
x
=
41.6
(
3
)
5.58÷x
=
3.1
(
4
)
4x
﹣
97
=
34.2
4.
解方程.
(
1
)
x÷0.26
=
10
(
2
)
x÷0.26
=
10
(
3
)
1.4x+9.2x
=
53
(
4
)
1.4x+9.2x
=
53
(<
br>5
)
4
(
x
﹣
0.7
)=
26
(
6
)
4
(
x
﹣
0.7
)=26
5.
解方程。
(
1
)
13x-7.5x=18.7
(
2
)
13x-7.5x=18.7
(
3
)
4
(
x-7.3
)
=32.8
(
4
)
4
(
x-7.3
)
=32.8
6.
解方程。
(
1
)
2.4×3+5
=15.2
(
2
)
7.5÷x=3
(
3
)
2.4×3+5 =15.2
(
4
)
9.6x-8x=7.2
(
5
)
9.6x-8x=7.2
(
6
)
4
(
x+0.9
)
=12.8
(
7
)
4
(
x+0.9
)
=12.8
7.
解方程.
(
1
)
x+ =
(
2
)
x+ =
(
3
)
x
=
(
4
)
x
=
(
5
)
8x+
=
(
6
)
8x+
=
8.
解方程.(第
②
题写出检验过程)
(
1
)
5x
﹣
3.7
=
4.8
(
2
)
5x
﹣
3.7
=
4.8
(
3
)
6
(
y
﹣
1.2
)=4.2
(
4
)
6
(
y
﹣
1
.2
)=
4.2
9.
解下列方程.
(
1
)
2x+1.5x
=
17.5
(<
br>2
)
6
(
x
﹣
1.5
)=
15
(
3
)(
x
﹣
8
)
÷2.9
=<
br>7
(
4
)
3x
﹣
4×6.5
=
7.6
10.
解下列方程
(
1
)
5+2.5x
=
62.5
(2
)(
2x
﹣
6
)
÷2
=
24
(
3
)
5x+12×3
=
56
11.
解方程。
(
1
)
x÷4.5=18
(
2
)
x÷4.5=18
(
3
)
6.2-x=0.45
(
4
)
6.2-x=0.45
(
5
)
8
(
x-3
)
=40.8
(
6
)
8
(
x-3
)
=40.8
12.
解方程。
(
1
)
3x+1.2=4
(
2
)
3x+1.2=4
(
3
)
1.5x-0.5=4
(
4
)
1.5x-0.5=4
(
5
)
5.6x-3.2x=60
(
6
)
5.6x-3.2x=60
13.
解方程。
(
1
)
37-x=1.8
(
2
)
2x +23×4=134
(
3
)(
x-3
)
÷2=7.5
14.
解方程。(带
★
要检验)
(
1
)
9.7x-5.3x=13.2
(
2
)
9.7x-5.3x=13.2
(
3
)
4
(
1.5-x
)
=2.4
(
4
)
4
(
1.5-x
)
=2.4
(
5
)
★12÷x=0.6
(
6
)
★12÷x=0.6
15.
解下列方程。
(
1
)
2x+1.5x=17.5
(
2
)
2x+1.5x=17.5
(
3
)
6
(
x-1.5
)
=15
(
4
)
6
(
x-1.5
)
=15
(
5
)(
x-8
)
÷2.9=7
(
6
)(
x-8
)
÷2.9=7
(
7
)
3x-4×6.5=7.6
(
8
)
3x-4×6.5=7.6
16.
解方程
(
1
)
9.6÷x=8
(
2
)
9.6÷x=8
(
3
)
x-0.2x=16
(
4
)
x-0.2x=16
(
5
)
3
(
x+2.1
)
=10.5
(
6
)
3
(
x+2.1
)
=10.5
17.
解方程。
(
1
)
4x+3.6=9.6
(
2
)
4x+3.6=9.6
(
3
)
12.8x-5.7x=35.5
(
4
)
12.8x-5.7x=35.5
(
5
)
5
(
x+6
)
=45
(
6
)
5
(
x+6
)
=45
18.
解方程。
(
1
)
x-7.9=2.6
(
2
)
1.4x+9.2x=53
(
3
)
6.8+3.2x=14.8
19.
利用等式性质解下列方程
(
1
)
3
(
x-1
)
=27
(写出此方程的检验过程)
(
2
)
4x+14=50
(
3
)
3
(
x-1
)
=27
(写出此方程的检验过程)
20.
解方程(加
※
检验)
(
1
)
※5x-7.2=20.2
(
2
)
※5x-7.2=20.2
(
3
)
2.5x-x=1.8
(
4
)
2.5x-x=1.8
(
5
)
4
(
18-x
)
=32.8
(
6
)
4
(
18-x
)
=32.8
答案解析部分
一、计算题
1.
【答案】
①4
+
x=8.6
解:
4
+
x-4=8.6-4
x=4.6
②x-1.5=2.7
解:
x-1.5+1.5=2.7+1.5
x=4.2
③0.6x=1.26
解:
0.6x÷0.6=1.26÷0.6
x=2.1
④27x+5x=128
解:
32x=128
x=4
⑤1.5+2x=11.5
解:
1.5+2x-1.5=11.5-1.5
2x=10
x=5
⑥25+6x=79
解:
25+6x-25=79-25
6x=54
x=9
2.
【答案】
(
1
)
5x
-
2
+
1.8
=
3.6
解:
5x-0.2
=
3.6
5x
=
3.6+0.2
5x
=
3.8
5x÷5=3.8÷5
x=0.76
(
2
)
7
(
x
-
1.2
)=
2.1
解:
7
(
x-1.2
)
÷7=2.1÷7
x-1.2=0.3
x-1.2+1.2=0.3+1.2
x=1.5
3.
【答案】
(
1
)
x+0.8
=
7.6
解:
x+0.8
﹣
0.8
=
7.6
﹣
0.8
x
=
6.8
(
2
)
6.2x
﹣
x
=
41.6
解:
5.2x
=
41.6
5.2x÷5.2
=
41.6÷5.2
x
=
8
(
3
)
5.58÷x
=
3.1
解:
5.58÷x×x
=
3.1×x
3.1x
=
5.58
3.1x÷3.1
=
5.58÷3.1
x
=
1.8
(
4
)
4x
﹣
97
=
34.2
解:
4x
﹣
97+97
=
34.2+97
4x
=
131.2
4x÷4
=
131.2÷4
x
=
32.8
4.
【答案】
(
1
)
x÷0.26
=
10
解:
x÷0.26×0.26
=
10×0.26
x
=
2.6
(
2
)
x÷0.26
=
10
解:
x÷0.26×0.26
=
10×0.26
x
=
2.6
(
3
)
1.4x+9.2x
=
53
解:
10.6x
=
53
10.6x÷10.6
=
53÷10.6
x
=
5
(
4
)
1.4x+9.2x
=
53
解:
10.6x
=
53
10.6x÷10.6
=
53÷10.6
x
=
5
(
5
)
4
(
x
﹣
0.7
)=
26
解:
4
(
x
﹣
0.7
)
÷4
=
26÷4
x
﹣
0.7
=
6.5
x
﹣
0.7+0.7
=
6.5+0.7
x
=
7.2
(
6
)
4
(
x
﹣
0.7
)=
26
解:
4
(
x
﹣
0.7
)
÷4
=
26÷4
x
﹣
0.7
=
6.5
x
﹣
0.7+0.7
=
6.5+0.7
x
=
7.2
5.
【答案】
(
1
)
13x-7.5x=18.7
解:
5.5x=18.7
x=18.7÷5.5
x=3.4
(
2
)
13x-7.5x=18.7
解:
5.5x=18.7
x=18.7÷5.5
x=3.4
(
3
)
4
(
x-7.3
)
=32.8
解:
x-7.3=32.8÷4
x-7.3=8.2
x=8.2+7.3
x=15.5
(
4
)
4
(
x-7.3
)
=32.8
解:
x-7.3=32.8÷4
x-7.3=8.2
x=8.2+7.3
x=15.5
6.
【答案】
(
1
)
2.4×3+5 =15.2
解:
7.2
+
5
=
15.2
7.2
+
5
-
7.2
=
15.2
-
7.2
5
=
8
=
1.6
(
2
)
7.5÷
=
3
解:
7.5÷ ×
=
3×
3
=
7.5
3 ÷3
=
7.5÷3
=
2.5
(
3
)
2.4×3+5
=15.2
解:
7.2
+
5
=
15.2
7.2
+
5
-
7.2
=
15.2
-
7.2
5
=
8
=
1.6
(
4
)
9.6x-8x=7.2
解:
1.6
=
7.2
1.6
÷1.6
=
7.2÷1.6
=
4.5
(
5
)
9.6x-8x=7.2
解:
1.6
=
7.2
1.6
÷1.6
=
7.2÷1.6
=
4.5
(
6
)
4
(
x+0.9
)
=12.8
解:
4
(
+
0.9
)
÷4
=
12.8÷4
+
0.9
=
3.2
+
0.9
-
0.9
=
3.2
-
0.9
=
2.3
(
7
)
4
(
x+0.9
)
=12.8
解:
4
(
+
0.9
)
÷4
=
12.8÷4
+
0.9
=
3.2
+
0.9
-
0.9
=
3.2
-
0.9
=
2.3
7.
【答案】
(
1
)
x+
=
解:
x+
﹣
=
﹣
x
=
(
2
)
x+
=
解:
x+
﹣
=
﹣
x
=
(
3
)
解:
x
=
x÷
=
÷
x
=
(
4
)
解:
x
=
x÷
=
÷
x
=
(
5
)
解:
8x+
=
8x+
﹣
=
﹣
8x
=
8x÷8
=
÷8
x
=
(
6
)
解:
8x+
=
8x+
﹣
=
﹣
8x
=
8x÷8
=
÷8
x
=
8.
【答案】
(
1
)
5x
﹣
3.7
=
4.8
解:
5x
﹣
3.7
=
4.8
5x
﹣
3.7+3.7
=
4.8+3.7
5x
=
8.5
5x÷5
=
8.5÷5
x
=
1.7
(
2
)
5x
﹣
3.7
=
4.8
解:
5x
﹣
3.7
=
4.8
5x
﹣
3.7+3.7
=
4.8+3.7
5x
=
8.5
5x÷5
=
8.5÷5
x
=
1.7
(
3
)
6
(
y
﹣
1.2
)=
4.2
解:
6
(
y
﹣
1.2
)=
4.2
6
(
y
﹣
1.2
)
÷6
=
4.2÷6
y
﹣
1.2
=
0.7
y
﹣
1.2+1.2
=
0.7+1.2
y
=
1.9
验算:
把
y=1.9
代
入原方程
6
(
y
﹣
1.2
)=
4.2
,<
br>
左边
=6×
(
1.9-1.2
)
=6×0.7
=4.2
右边
=4.2
左边
=
右边
所以,
y=1.9
是方程
6
(
y
﹣
1.2
)=
4.2
的解。
(
4
)
6
(
y
﹣
1.2
)=
4.2
解:
6
(
y
﹣
1.2
)=
4.2
6
(
y
﹣
1.2
)
÷6
=
4.2÷6
y
﹣
1.2
=
0.7
y
﹣
1.2+1.2
=
0.7+1.2
y
=
1.9
验算:
把
y=1.9
代
入原方程
6
(
y
﹣
1.2
)=
4.2
,<
br>
左边
=6×
(
1.9-1.2
)
=6×0.7
=4.2
右边
=4.2
左边
=
右边
所以,
y=1.9
是方程
6
(
y
﹣
1.2
)=
4.2
的解。
9.
【答案】
(
1
)
2x+1.5x
=
17.5
解:
3.5x
=
17.5
3.5x÷3.5
=
17.5÷3.5
x
=
5
(
2
)
6
(
x
﹣
1.5
)=
15
解:
6
(
x
﹣
1.5
)
÷6
=
15÷6
x
﹣
1.5
=
2.5
x
﹣
1.5+1.5
=
2.5+1.5
x
=
4
(
3
)
(
x
﹣
8
)
÷2.9
=
7
解:
(
x
﹣
8
)
÷2.9×2.9
=
7×2.9
x
﹣
8
=
20.3
x
﹣
8+8
=
20.3+8
x
=
28.3
(
4
)
3x
﹣
4×6.5
=
7.6
解:
3x
﹣
26
=
7.6
3x
﹣
26+26
=
7.6+26
3x
=
33.6
3x÷3
=
33.6÷3
x
=
11.2
10.
【答案】
(
1
)
5+2.5x
=
62.5
解:
5+2.5x
﹣
5
=
62.5
﹣
5
2.5x
=
57.5
2.5x÷2.5
=
57.5÷2.5
x
=
23
(
2
)
(
2x
﹣
6
)
÷2
=
24
解:(
2x
﹣
6
)
÷2×2
=
24×2
2x
﹣
6
=
48
2x
﹣
6+6
=
48+6
2x
=
54
2x÷2
=
54÷2
x
=
27
(
3
)
5x+12×3
=
56
解:
5x+36
=
56
5x+36
﹣
36
=
56
﹣
36
5x
=
20
5x÷5
=
20÷5
x
=
4
11.
【答案】
(
1
)
x÷4.5=18
解:
x÷4.5×4.5=18×4.5
x=81
(
2
)
x÷4.5=18
解:
x÷4.5×4.5=18×4.5
x=81
(
3
)
6.2-x=0.45
解:
6.2-x+x=0.45+x
0.45+x=6.2
0.45+x-0.45=6.2-0.45
x=5.75
(
4
)
6.2-x=0.45
解:
6.2-x+x=0.45+x
0.45+x=6.2
0.45+x-0.45=6.2-0.45
x=5.75
(
5
)
8
(
x-3
)
=40.8
解:
8
(
x-3
)
÷8=40.8÷8
x-3=5.1
x-3+3=5.1+3
x=8.1
(
6
)
8
(
x-3
)
=40.8
解:
8
(
x-3
)
÷8=40.8÷8
x-3=5.1
x-3+3=5.1+3
x=8.1
12.
【答案】
(
1
)
3x+1.2=4
解:
3x=4-1.2
3x=2.8
x=2.8÷3
x=
(
2
)
3x+1.2=4
解:
3x=4-1.2
3x=2.8
x=2.8÷3
x=
(
3
)
1.5x-0.5=4
解:
1.5x=4+0.5
1.5x=4.5
x=4.5÷1.5
x=3
(
4
)
1.5x-0.5=4
解:
1.5x=4+0.5
1.5x=4.5
x=4.5÷1.5
x=3
(
5
)
5.6x-3.2x=60
解:
2.4x=60
x=60÷2.4
x=25
(
6
)
5.6x-3.2x=60
解:
2.4x=60
x=60÷2.4
x=25
13.
【答案】
(
1
)
解:
37-x+x=1.8+x
1.8+x=37
1.8+x-1.8=37-1.8
x=35.2
(
2
)
2x +23×4=134
解:
2x+92=134
2x+92-92=134-92
2x=42
37-x=1.8
2x÷2=42÷2
x=21
(
3
)
(
x-3
)
÷2=7.5
解:
(
x-3
)
÷2×2=7.5×2
x-3=15
x-3+3=15+3
x=18
14.
【答案】
(
1
)
9.7x-5.3x=13.2
解:
4.4x=13.2
x=13.2÷4.4
x=3
(
2
)
9.7x-5.3x=13.2
解:
4.4x=13.2
x=13.2÷4.4
x=3
(
3
)
4
(
1.5-x
)
=2.4
解:
1.5-x=2.4÷4
1.5-x=0.6
x=1.5-0.6
x=0.9
(
4
)
4
(
1.5-x
)
=2.4
解:
1.5-x=2.4÷4
1.5-x=0.6
x=1.5-0.6
x=0.9
(
5
)
12÷x=0.6
解:
x=12÷0.6
x=20
(
6
)
12÷x=0.6
解:
x=12÷0.6
x=20
15.
【答案】
(
1
)
2x+1.5x=17.5
解:
3.5x=17.5
3.5x÷3.5=17.5÷3.5
x=5
(
2
)
2x+1.5x=17.5
解:
3.5x=17.5
3.5x÷3.5=17.5÷3.5
x=5
(
3
)
6
(
x-1.5
)
=15
解:
6
(
x-1.5
)
÷6=15÷6
x-1.5=2.5
x-1.5+1.5=2.5+1.5
x=4
(
4
)
6
(
x-1.5
)
=15
解:
6
(
x-1.5
)
÷6=15÷6
x-1.5=2.5
x-1.5+1.5=2.5+1.5
x=4
(
5
)
(
x-8
)
÷2.9=7
解:
(
x-8
)
÷2.9×2.9=7×2.9
x-8=20.3
x-8+8=20.3+8
x=28.3
(
6
)
(
x-8
)
÷2.9=7
解:
(
x-8
)
÷2.9×2.9=7×2.9
x-8=20.3
x-8+8=20.3+8
x=28.3
(
7
)
3x-4×6.5=7.6
解:
3x-26=7.6
3x-26+26=7.6+26
3x=33.6
3x÷3=33.6÷3
x=11.2
(
8
)
3x-4×6.5=7.6
解:
3x-26=7.6
3x-26+26=7.6+26
3x=33.6
3x÷3=33.6÷3
x=11.2
16.
【答案】
(
1
)
9.6÷x=8
解:
x=9.6÷8
x=1.2
(
2
)
9.6÷x=8
解:
x=9.6÷8
x=1.2
(
3
)
x-0.2x=16
解:
0.8x=16
x=20
(
4
)
x-0.2x=16
解:
0.8x=16
x=20
(
5
)
3
(
x+2.1
)
=10.5
解:
x+2.1=10.5÷3
x+2.1=3.5
x=3.5-2.1
x=1.4
(
6
)
3
(
x+2.1
)
=10.5
解:
x+2.1=10.5÷3
x+2.1=3.5
x=3.5-2.1
x=1.4
17.
【答案】
(
1
)
4x+3.6=9.6
解:
4x=9.6-3.6
4x=6
x=6÷4
x=1.5
(
2
)
4x+3.6=9.6
解:
4x=9.6-3.6
4x=6
x=6÷4
x=1.5
(
3
)
12.8x-5.7x=35.5
解:
7.1x=35.5
x=35.5÷7.1
x=5
(
4
)
12.8x-5.7x=35.5
解:
7.1x=35.5
x=35.5÷7.1
x=5
(
5
)
5
(
x+6
)
=45
解:
x+6=45÷5
x+6=9
x=9-6
x=3
(
6
)
5
(
x+6
)
=45
解:
x+6=45÷5
x+6=9
x=9-6
x=3
18.
【答案】
(
1
)
x-7.9=2.6
解:
x-7.9+7.9=2.6+7.9
x=10.5
(
2
)
1.4x+9.2x=53
解:
10.6x=53
10.6x÷10.6=53÷10.6
x=5
(
3
)
6.8+3.2x=14.8
解:
3.2x=14.8-6.8
3.2x=8
x=2.5
19.
【答案】
(
1
)
3
(
x-1
)
=27
解:
3
(
x-1
)
÷3=27÷3
x-1=9
x-1+1=9+1
x=10
(
2
)
4x+14=50
解:
4x+14-14=50-14
4x=36
4x÷4=36÷4
x=9
(
3
)
3
(
x-1
)
=27
解:
3
(
x-1
)
÷3=27÷3
x-1=9
x-1+1=9+1
x=10
20.
【答案】
(
1
)
5x-7.2=20.2
解:
5x=20.2+7.2
5x=27.4
x=27.4÷5
x=5.48
;
检验:
方程的左边
=5x-7.2
=5×5.48-7.2
=27.4-7.2
=20.2
=
方程的右边
所以,
x=5.48
是方程的解。
(
2
)
5x-7.2=20.2
解:
5x=20.2+7.2
5x=27.4
x=27.4÷5
x=5.48
;
检验:
方程的左边
=5x-7.2
=5×5.48-7.2
=27.4-7.2
=20.2
=
方程的右边
所以,
x=5.48
是方程的解。
(
3
)
2.5x-x=1.8
解:
1.5x=1.8
x=1.8÷1.5
x=1.2
(
4
)
2.5x-x=1.8
解:
1.5x=1.8
x=1.8÷1.5
x=1.2
(
5
)
4
(
18-x
)
=32.8
解:
18-x=32.8÷4
18-x=8.2
18-x+x=8.2+x
18=8.2+x
18-8.2=8.2+x-8.2
x=9.8
(
6
)
4
(
18-x
)
=32.8
解:
18-x=32.8÷4
18-x=8.2
18-x+x=8.2+x
18=8.2+x
18-8.2=8.2+x-8.2
x=9.8