计算 -1/2(2x+3y)-2/3(4x-5y).
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
计算:(-x-2y) * (3x-y)
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(x+y)(x+y)^2(-x-y)^3
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
方程式计算5X-2=Y 4X+3=Y 求X.Y
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:(x+y)^2×(-x-y)^3×[-3/4(x-y)^3]×5/6(y-x)^2
计算:[(2x - 3y)^2 - (x-y)(4x+2y)] / 2y
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)