计算：(3x+2y)2-(3x-2y)2,

计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y) 计算:(-x-2y) * (3x-y) 计算：(x+y)-3(x-2y). 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算：x+2y/x-y+2x/y-x-3y/x-y 计算:y×(y/x)^3÷[-(x^2)/y]^-2 计算：y(x-y)^2+(y-x)^3=? 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 计算：x(x-3y)(5x-2y) 计算:(2x-3y)^2+(x-y)(x+y)+(2x+3y)^2 计算 ：(2x-y)(2x+y)-(3x-2y)(-3x-2y) [(2x+y)(x-3y)+y(x+3y)]÷(2x)计算, (x-3y)(y+2x)-(4y-3x)(3x+4y)计算 计算（x-y)^2×(x-y)^3×（y-x）×（y-x)^2 用分式加减法计算：3x-y/2x-y - x-y/y-2x