设m=ab/(a^2-ab),则m^2/(am-b)-m/a可化简为
问题描述：
设m=ab/(a^2-ab),则m^2/(am-b)-m/a可化简为
答
m^2/(am-b)-m/a=
am^2/a(am-b)-m(am-b)/a(am-b)=
bm/a(am-b)=
将m=ab/(a^2-ab）代入上式 化简
bm/a(am-b)=1/a