题目内容
解方程.
(1)37.5+20%X=69.5
(2)120+
Χ=168
(3)
÷χ=
.
(1)37.5+20%X=69.5
(2)120+
| 4 |
| 5 |
(3)
| 3 |
| 5 |
| 6 |
| 7 |
(1)37.5+20%X=69.5,
37.5+0.2X=69.5,
37.5+0.2X-37.5=69.5-37.5,
0.2X=32,
0.2X÷0.2=32÷0.2,
x=160;
(2)120+
x=168,
120+0.8x=168,
120+0.8x-120=168-120,
0.8x=48,
0.8x÷0.8=48÷0.8,
x=60;
(3)
÷x=
,
÷x×x=
×x,
x=
,
x×
=
×
,
x=
.
37.5+0.2X=69.5,
37.5+0.2X-37.5=69.5-37.5,
0.2X=32,
0.2X÷0.2=32÷0.2,
x=160;
(2)120+
| 4 |
| 5 |
120+0.8x=168,
120+0.8x-120=168-120,
0.8x=48,
0.8x÷0.8=48÷0.8,
x=60;
(3)
| 3 |
| 5 |
| 6 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 7 |
| 6 |
| 3 |
| 5 |
| 7 |
| 6 |
x=
| 7 |
| 10 |
练习册系列答案
相关题目