x-2y/x+y 减 x-y/x+y 加 -x-4y/x+4y

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x-2y/x+y 减 x-y/x+y 加 -x-4y/x+4y
初二上学期分式的加减.

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x-2y/x+y 减 x-y/x+y 加 -x-4y/x+4y
=[x-2y-(x-y)]/(x+y) 加 -(x+4y)/(x+4y)
=[x-2y-x+y]/(x+y) - (x+4y)/(x+4y)
= -y/(x+y) - 1

{(x,y) |x|+|y| x>y?x:y x^2-y^2/x+y-4x(x-y)+y^2/2x-y, x(x-y)+4(y-x)因式分解 (2x-y)^2-4(x-y)(x+2y) (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y x+2y+4y^2/x-y+4x^y/4y^2-x^2 4x(y-x)-y^2因式分解 (x+3y-4)(2x-y) x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2