16x^2-24xy+9y^2
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(xy-x^2)乘以(xy)/(x-y)
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知2x-3根号xy-2y=0(x>0),求x^2+4xy-16y^2/x^2+xy-9y^2
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
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
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
(x+y-2xy)(x+y-2)+(1-xy)²
(x^2-xy)y÷y-x/xy怎么做?
x*-2xy+3y*=9 4x*-5xy+6y*=30
x-y/x²÷x²-2xy+y²/xy*(xy-x²)