已知方程:①3x-1=2x+1,②x+
=
(x-
)x,③
+
=7-
,④
x-1=x中,解为x=2的是方程( )
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 7 |
| 2 |
| 1+3x |
| 4 |
| 3x+1 |
| 4 |
| 3 |
| 2 |
| A.①、②和③ | B.①、③和④ | C.②、③和④ | D.①、②和④ |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 7 |
| 2 |
| 1+3x |
| 4 |
| 3x+1 |
| 4 |
| 3 |
| 2 |
| A.①、②和③ | B.①、③和④ | C.②、③和④ | D.①、②和④ |