题目内容
| 解方程. X-
|
| 5X=7 | X÷0.5=0.78. |
(1)x-
=
,
x-
+
=
+
,
x=1
;
(2)
+x=
,
+x-
=
-
,
x=
;
(3)5x=7,
5x÷5=7÷5,
x=1.4;
(4)x÷0.5=0.78,
x÷0.5×0.5=0.78×0.5,
x=0.39.
| 7 |
| 9 |
| 7 |
| 9 |
x-
| 7 |
| 9 |
| 7 |
| 9 |
| 7 |
| 9 |
| 7 |
| 9 |
x=1
| 5 |
| 9 |
(2)
| 5 |
| 7 |
| 3 |
| 2 |
| 5 |
| 7 |
| 5 |
| 7 |
| 3 |
| 2 |
| 5 |
| 7 |
x=
| 11 |
| 14 |
(3)5x=7,
5x÷5=7÷5,
x=1.4;
(4)x÷0.5=0.78,
x÷0.5×0.5=0.78×0.5,
x=0.39.
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