题目内容
解方程,我没问题!
①x-
x=21②
:18%=
.
①x-
| 2 |
| 9 |
| 3 |
| 20 |
| 6.5 |
| x |
①x-
x=21,
(1-
)x=21,
x=21,
x×
=21×
,
x=27;
②
:18%=
,
x=18%×6.5,
x=1.17,
x×
=1.17×
,
x=7.8.
| 2 |
| 9 |
(1-
| 2 |
| 9 |
| 7 |
| 9 |
| 7 |
| 9 |
| 9 |
| 7 |
| 9 |
| 7 |
x=27;
②
| 3 |
| 20 |
| 6.5 |
| x |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 20 |
| 20 |
| 3 |
| 20 |
| 3 |
x=7.8.
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