下列方程变形中,正确的是( )
(1)由3x+6=0变形,得x+2=0;(2)由5-3x=x+7变形,得-2x=2;
(3)由
x=2变形,得3x=14;(4)由4x=-2变形,得x=-2.
(1)由3x+6=0变形,得x+2=0;(2)由5-3x=x+7变形,得-2x=2;
(3)由
| 3 |
| 7 |
| A、(1)(3) |
| B、(1)(2)(3) |
| C、(3)(4) |
| D、(1)(2)(4) |
| 3 |
| 7 |
| A、(1)(3) |
| B、(1)(2)(3) |
| C、(3)(4) |
| D、(1)(2)(4) |