[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y

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[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y[(-x-y)(-x+y)-(x+y)^2-x(y-y^

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
=[x²-y²-x²-2xy-y²-xy+xy²]/(y/2)
=[(x-2)y²-3xy]/(y/2)
=2xy-6x-4y

你没有写清楚啊

原式=[x^2-y^2-x^2-2*x*y-y^2-x*y+x*y^2]/(1/(2*y))
=-2(y^2+3*x*y+x*y^2)/y
=-2(y+3*x+x*y)
不知道你的是在分母上还是分子上
我是按在分母上做的。而且你说的乘法公式我也不明白啥意思。劳烦以后能说明白。

10分，，谁做啊。。

不明白

{(x,y) |x|+|y| x>y?x:y x^/y-x-y^/y-x化简. 化简x(y-x)-y(x-y) 行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y | y/(x+y)-x/(x-y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x y x+yy x+y xx+y x y (3x-y)(3y+x)-(x-y)(x+y) 化简x/y(x+y)-y/x(x+y) 化简 x / y(x+y) - y / x(x+y) = 化简:(x+ y)(x-y) +(x+ y) +(x-y) x+y (x+y) |x+y| x y x+yy x+y xx+y x y 化简y(x+y)+(x+y)(x-y)-x^2 |x|+|y|