(2x+3y)(4x+7y)
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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
x-4y分之3x + 4y-x分之x+y - x*x-4y分之7y
4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y
(-3x+7y)(-7y-3x)-(x-3y)(2x+3y)
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
因式分解(X+2Y)(3X-7Y)平方-4(X+2Y)(X+Y)平方