题目内容
解方程.
|
x÷
|
|
(1)
x=
,
x×
=
×
,
x=
;
(2)x÷
=
,
x÷
×
=
×
,
x=
;
(3)
x÷
=
,
x÷
×
=
×
,
x=
,
x×
=
×
,
x=
.
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
| 8 |
| 7 |
| 21 |
| 40 |
| 8 |
| 7 |
x=
| 3 |
| 5 |
(2)x÷
| 3 |
| 5 |
| 2 |
| 3 |
x÷
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 3 |
| 3 |
| 5 |
x=
| 2 |
| 5 |
(3)
| 8 |
| 9 |
| 1 |
| 3 |
| 2 |
| 15 |
| 8 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 15 |
| 1 |
| 3 |
| 8 |
| 9 |
| 2 |
| 45 |
| 8 |
| 9 |
| 9 |
| 8 |
| 2 |
| 45 |
| 9 |
| 8 |
x=
| 1 |
| 20 |
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