计算:(x-2y)(x+2y)+(2x-y)(2x+y) 计算:(x²+2)(x²-2)-(x-2)
计算(x²/x+2y)-x+2y-2
计算:(-x-2y) * (3x-y)
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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)
计算:(x+y/x-y)÷(xy+x^2)
(x^2+xy/x-y)/(xy/x-y)计算
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
计算:1/2x-1/x+y×(x+y/2x-x-y)
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2