(1分之x+1分之y)/(1分之x²-1分之y²)怎么解!速度回答
问题描述：
(1分之x+1分之y)/(1分之x²-1分之y²)怎么解!速度回答
答
都写反了,是x分之1,y分之1,……(1/x+ 1/y)/(1/x²-1/y²)=[(x+y)/(xy)]/[(y²-x²)/(x²y²)]=(x+y)x²y²/[xy(y²-x²)]=(x+y)x²y²/[xy(x+y)(y-x)]=xy/(y-x)...