计算:1/2x-(-3/2x+1/3y^2)+(-2/3y^2+2x)
计算:(-x-2y) * (3x-y)
计算(x+y)(x+y)^2(-x-y)^3
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
(2x+y)(x+3y-1)计算
计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8
计算:(2/3x√9x+6x√y/x)+(y√x/y-√1/x)
1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)
已知x=2+根号3,y=2-根号3,计算代数式(x+y/x-y-x-y/x+y)乘以(1/x^2-1/y^2)
分解因式计算:x^2(x-y)+(y-x)=?x^3+x^2+1\4x=?(2x+y)^2-(x-2y)^2=?
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2