作业帮化简(2x/(x+y)-4x/(y-x))/8x(x^2-y^2)得
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化简(2x/(x+y)-4x/(y-x))/8x(x^2-y^2)得
化简(2x/(x+y)-4x/(y-x))/8x(x^2-y^2)得
化简(2x/(x+y)-4x/(y-x))/8x(x^2-y^2)得
原式=[2x/(x+y)+4x/(x-y)]/8x*(x+y)(x-y)
=2x[(x-y+2x+2y)/(x+y)(x-y)]/8x*(x+y)(x-y)
=(3x+y)/(x+y)(x-y)4*(x+y)(x-y)
=(3x+y)/4