1.(x/y-y/x)/(x+y) 2.(x的平方-4分之2x-x-2分之1)乘x-1分之x+2
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1.(x/y-y/x)/(x+y) 2.(x的平方-4分之2x-x-2分之1)乘x-1分之x+2
1.(x/y-y/x)/(x+y) 2.(x的平方-4分之2x-x-2分之1)乘x-1分之x+2
1.(x/y-y/x)/(x+y) 2.(x的平方-4分之2x-x-2分之1)乘x-1分之x+2
1.原式=(x/y-y/x)*1/x+y=(x^2/xy-y^2/xy)*(1/x+y)=(x+y)(x-y)/xy*(1/x+y)=x-y/xy
{(x,y) |x|+|y|
x>y?x:y
x^2-y分之y(x-y)-x(x+y)除以x+y分之x^2+y^2.其中x=2,y=-1.先化简再求值.
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
感激不尽1.x,y满足(x-y-1)(x+y)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2)/2(x-y)^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|