已知X+y=6,xy=7 求x^2y+xy^2=
已知X+y=6,xy=7 求x^2y+xy^2=
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x/y=2,求 [x^2-xy+3xy^2 ] / [ x^2+xy+6y^2]的值
已知xy^2=-2求xy(2x^3y^7+5x^2y
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
已知x+xy=-2,xy-y=-6求代数式2x{-4y-3[(x+xy)²+x]-½[(y-xy
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)