题目内容
| 解方程. 250+X=640 | 0.4X=2.4 |
| X÷5=120 | X-0.64=4.35. |
(1)250+X=640,
250+X-250=640-250,
X=390;
(2)0.4X=2.4,
0.4X÷0.4=2.4÷0.4,
X=6;
(3)X÷5=120,
X÷5×5=120×5,
X=600;
(4)X-0.64=4.35,
X-0.64+0.64=4.35+0.64,
X=4.99.
250+X-250=640-250,
X=390;
(2)0.4X=2.4,
0.4X÷0.4=2.4÷0.4,
X=6;
(3)X÷5=120,
X÷5×5=120×5,
X=600;
(4)X-0.64=4.35,
X-0.64+0.64=4.35+0.64,
X=4.99.
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