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