题目内容
解方程.
7x=
x=
x=
.
7x=
| 5 |
| 8 |
| 7 |
| 8 |
| 21 |
| 40 |
| 2 |
| 21 |
| 7 |
| 24 |
(1)7x=
,
7x÷7=
÷7,
x=
×
,
x=
;
(2)
x=
,
x÷
=
÷
,
x=
×
,
x=
;
(3)
x=
,
x÷
=
÷
,
x=
×
,
x=
.
| 5 |
| 8 |
7x÷7=
| 5 |
| 8 |
x=
| 5 |
| 8 |
| 1 |
| 7 |
x=
| 5 |
| 56 |
(2)
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
x=
| 21 |
| 40 |
| 8 |
| 7 |
x=
| 3 |
| 5 |
(3)
| 2 |
| 21 |
| 7 |
| 24 |
| 2 |
| 21 |
| 2 |
| 21 |
| 7 |
| 24 |
| 2 |
| 21 |
x=
| 7 |
| 24 |
| 21 |
| 2 |
x=
| 49 |
| 16 |
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