(2x^2y+3xy^2)-(6x^2y-3xy^2)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^2-xy-6y^2+3xy+y+2
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(xy-x^2)乘以(xy)/(x-y)
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
(-3x^y+2xy)-( )=4x^+xy
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2