15x^2-47xy+28y ^2
(xy-x^2)乘以(xy)/(x-y)
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
(x^2+xy/x-y)/(xy/x-y)计算
2x^2-xy-15y^2
6x^2y^2+xy-15
(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)
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
计算(xy-y^2)÷x-y/xy