1.1/ax =b/abx1/bx=a/abx最简公分母：abx2.b/a-x=by/(a-x)yc/ay-xy =c/(a-x)y最简公分母：(a-x)y3.2/x+1=2(x+2)/(x+1)(x+2)2/x+2=2(x+1)/(x+1)(x+2)最简公分母：(x+1)(x+2)4.1/2x+5=（2x-5）/(2x-5)(2x+5)2/4x²...计算题：xy(x+y)/(x-y)² X x-y/xy+y²(y/6x²)²÷(-y²/4x)²xy(x+y)/(x-y)² X x-y/xy+y²=xy(x+y)/(x-y)² X x-y/y(x+y)=x/(x-y)(y/6x²)²÷(-y²/4x)²=y^2/36x^4÷(y^4/16x^2)=y^2/36x^4X16x^2/y^4=4/9x^2y^2“^”后面是几次方的意思不客气呵呵呵