x^2-12xy+36y^2
(xy-x^2)乘以(xy)/(x-y)
x^2+xy+x=36,y^2+xy+y=20,求x+y.
(x^2+xy/x-y)/(xy/x-y)计算
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
(x+y-2xy)(x+y-2)+(1-xy)²
(x^2-xy)y÷y-x/xy怎么做?
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
-12xy*3x^2y-x^2y*(-3xy)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)
x^2-xy-6y^2+3xy+y+2
分解因式:xy(xy+1)+(xy+3)−2(x+y+12)−(x+y−1)