m/(x-2)+4=(1-x)/(2-x)两边乘以x-2得m+4x-8=x-1x=(7-m)/3已知分式项中分母为x-2和2-xx≠2(7-m)/3≠2 m≠1当m=1时,分式方程m/x-2+4=1-x/2-x无解