(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(xy-x^2)乘以(xy)/(x-y)
x^2-xy-6y^2+3xy+y+2
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(x^2+xy/x-y)/(xy/x-y)计算
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(x+y-2xy)(x+y-2)+(1-xy)²
(x^2-xy)y÷y-x/xy怎么做?
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.