x^2-12xy+36y^2-6x+36y+8

x^2+xy+x=36,y^2+xy+y=20,求x+y. (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 先化简再求值(6x√y/x +3/y*√xy^3)-(4x√x/y +√36xy) 已知X=3/2,y=27 x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 因式分解:8(x-2y)-x(7x+y)+xy. 因式分解：(一)27x^2+54x^2y+36xy^2+8y^3 (二)1-3(x-y)+3(x-y)^2-(x-y)^ （xy-x^2)乘以(xy)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算 x^2-xy-6y^2+3xy+y+2 因式分解：x×x-xy-2y×y-x-y