计算,(x-3y)(x+3y)-(x-3y)^2112^2-113×111(2x-3)(x+4)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
计算:(-x-2y) * (3x-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)(x+y)^2(-x-y)^3
计算:(3x-y)2-(2x+y)2+5x(y-x)
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算:(x-4y)(2x+3y)-(x+2y)(x-y).
计算 1.(-2x)^3-3x乘(x-2x^2) 2.【(x+2y)^2-(x-2y)(x+2y)】÷4y
(x+y)^2-(3x-2y)^2计算