题目内容
解方程.
x=21
x=
x=
.
| 3 |
| 7 |
| 5 |
| 8 |
| 25 |
| 36 |
| 7 |
| 20 |
| 21 |
| 50 |
(1)
x=21
x×
=21×
x=49;
(2)
x=
x×
=
×
x=
;
(3)
x=
x×
=
×
x=
.
| 3 |
| 7 |
| 3 |
| 7 |
| 7 |
| 3 |
| 7 |
| 3 |
x=49;
(2)
| 5 |
| 8 |
| 25 |
| 36 |
| 5 |
| 8 |
| 8 |
| 5 |
| 25 |
| 36 |
| 8 |
| 5 |
x=
| 10 |
| 9 |
(3)
| 7 |
| 20 |
| 21 |
| 50 |
| 7 |
| 20 |
| 20 |
| 7 |
| 21 |
| 50 |
| 20 |
| 7 |
x=
| 6 |
| 5 |
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