计算：(x+3y)(x-3y)-(x-3y)

计算 x(x-3y) 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 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：(x+3y)(x-3y)-(x-3y) 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算 3x+4y/x-y+3y/y-x-4x/x-y 计算：x+2y/x-y+2x/y-x-3y/x-y 计算(x+y)(x-y)(x+y)3次方(x-y)5次方计算(x+y)×(x-y)×(x+y)3次方×(x-y)5次方 计算n阶段行列式 请帮我解答：计算此3阶段行列式 | x y x+y| | y x+y x | |x+y x y || x y x+y || y x+y x | |x+y x y | 计算：x(x-3y)(5x-2y) 计算 x(x-3y)(x-5y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 计算：y(x-y)^2+(y-x)^3=? 计算:y×(y/x)^3÷[-(x^2)/y]^-2