用换元法解分式方程
+
=3时,设
=y,则原方程可化为整式方程( )
| 1-x |
| x2+2 |
| 2(x2+2) |
| 1-x |
| 1-x |
| x2+2 |
| A.y2+3y+2=0 | B.y2+2y+3=0 | C.y2+2y-3=0 | D.y2-3y+2=0 |
| 1-x |
| x2+2 |
| 2(x2+2) |
| 1-x |
| 1-x |
| x2+2 |
| A.y2+3y+2=0 | B.y2+2y+3=0 | C.y2+2y-3=0 | D.y2-3y+2=0 |