y^2-2(√x+1/√x)y+3
计算:(2/3x√9x+6x√y/x)+(y√x/y-√1/x)
若x,y∈{-√3,-1,1,2},则(x,y)∈{(x,y)|x^2+y^2
|2x+y+1|+√2y+3x=0则x.y=
1、x(x-y)(x+y)-x(x+y)^2
数学题化简再求值(1/x-y+1/x+y)÷x^2 y^2/x^2-y^2,其中x=3,y=-√2
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
(1)(x^2/x)-y-x-y
化简1) (-2x^ y^)(3x^ y^)(-4x^ y^)2) (6√x)\(3√x√x^5)3)已知函数f(x)的
y=ln(x+√x^2+1),求y
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)