题目内容
解方程.
2x-
| 3x+
| x-0.28x=12.96. |
(1)2x-
x=13
(2-
)x=13
x=13
x×4=13×4
x=52;
(2)3x+
x=
(3+
)x=
x=
x×
=
×
x=
;
(3)x-0.28x=12.96
0.72x=12.96
0.72x÷0.72=12.96÷0.72
x=18.
| 7 |
| 4 |
(2-
| 7 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
x=52;
(2)3x+
| 1 |
| 3 |
| 20 |
| 21 |
(3+
| 1 |
| 3 |
| 20 |
| 21 |
| 10 |
| 3 |
| 20 |
| 21 |
| 10 |
| 3 |
| 3 |
| 10 |
| 20 |
| 21 |
| 3 |
| 10 |
x=
| 2 |
| 7 |
(3)x-0.28x=12.96
0.72x=12.96
0.72x÷0.72=12.96÷0.72
x=18.
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