题目内容
下列方程的解是x=
的是( )
| 3 |
| 7 |
A.5x=
| B.x÷
| C.
|
A,若x=
,那么左边=5x=5×
=
,右边=
,左边≠右边,
B,若x=
,那么左边=x÷
=
÷
=
,右边=
,左边=右边,
C,若x=
,那么左边=
x÷
=
×
÷
=
,右边=12,左边≠右边,
故选B.
| 3 |
| 7 |
| 3 |
| 7 |
| 15 |
| 7 |
| 15 |
| 19 |
B,若x=
| 3 |
| 7 |
| 4 |
| 5 |
| 3 |
| 7 |
| 4 |
| 5 |
| 15 |
| 28 |
| 15 |
| 28 |
C,若x=
| 3 |
| 7 |
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 3 |
| 7 |
| 1 |
| 4 |
| 8 |
| 7 |
故选B.
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