1.
两边乘X(X-2)
X=3(X-2)
X=3X-6
X=3
分式方程要检验
经检验,X=3是方程的解
2.
原式=[-(X-3)²/(X+3)(X-3)]÷[2(X-3)/X(X+3)]
=[-(X-3)²/(X+3)(X-3)]×[X(X+3)/2(X-3)]
=-X(X+3)(X-3)²/[(X+3)(X-3)2(X-3)]
=-X/2