y/(x+y)-x/(x-y)
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y/(x+y)-x/(x-y)y/(x+y)-x/(x-y)y/(x+y)-x/(x-y)y/(x+y)-x/(x-y)=y(x-y)/(x+y)(x-y)-x(x+y)/(x+y)(x-y)=[y(
y/(x+y)-x/(x-y)
y/(x+y)-x/(x-y)
y/(x+y)-x/(x-y)
y/(x+y)-x/(x-y)
=y(x-y) /(x+y)(x-y) -x(x+y) /(x+y) (x-y)
=[y(x-y) -x(x+y)] /(x+y) (x-y)
=[xy-y^2 -x^2-xy] /(x+y) (x-y)
=[-y^2-x^2] /(x+y) (x-y)
=-(x^2+y^2)/(x^2-y^2)
-1
y/(x+y)-x/(x-y)={y(x-y)-x(x+y)}/x²-y²=xy-y²-x²-xy/x²-y²=-(y²+x²)/x²-y²
y / (x+y) - x / (x-y)
= y (x-y) / (x² - y²) - x (x+y) / (x² - y²)
= [y (x-y) - x (x+y)] / (x² - y²) [y (x-y) - x (x+y)] = xy - y² - x² - xy = - y² - x²
= - (x² + y²) / (x² - y²)
{(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|