题目内容
| 求X的值: X-
| 210+X=640 | 0.7X=0.56. |
(1)X-
=
,
X-
+
=
+
,
X=
;
(2)210+X=640,
210+X-210=640-210,
X=430;
(3)0.7X=0.56,
0.7X÷0.7=0.56÷0.7,
X=0.8.
| 1 |
| 8 |
| 5 |
| 8 |
X-
| 1 |
| 8 |
| 1 |
| 8 |
| 5 |
| 8 |
| 1 |
| 8 |
X=
| 3 |
| 4 |
(2)210+X=640,
210+X-210=640-210,
X=430;
(3)0.7X=0.56,
0.7X÷0.7=0.56÷0.7,
X=0.8.
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