计算 ：(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2（2x-5y+3)(2x+5y-3)(x-2y)(x-3y)-(3x-2y)^2

计算：x(x-3y)(5x-2y) 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-(x-5y)-(-3x+2y) 计算：(x-5y)^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[(x+2y)²-(x+y)(x-y)-5y²]÷(2x) 2（x+3y)(x-2y)-3(2x+y)(2x-3y)+5(x-2y)(x+2y)计算, (3x-y)^2+(2x+3y)(-2x-3y)+5xy 计算急 计算 2(x+y)*3(x+y)*5(x+y)^5 计算3x-2y-(9x-7y)+2(4x-5y) 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算：（X+Y）^5÷（-X-Y)^3*(X-Y）^2 计算:(x-y)∧3 × (y-x)∧2 × (y-x)∧5 方程式计算5X-2=Y 4X+3=Y 求X.Y 计算(x+y)(x+y)^2(-x-y)^3