2(x^2-xy)-3(2x^2-3xy)-2[x^2-(2x^2-xy+y^2)]求答案!
(xy-x^2)乘以(xy)/(x-y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
(x^2+xy/x-y)/(xy/x-y)计算
已知:xy+x=-1,xy-y=-2,求多项式-x-[2y-2(xy+x)的平方+3x]+2[x+(xy-y)的平方]的
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.