x+y=6 xy=-3 x^2y+xy^2=?
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
已知x-y=4xy,则2x+3xy-2yx-2xy-y
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
已知x+xy=-2,xy-y=-6求代数式2x{-4y-3[(x+xy)²+x]-½[(y-xy
已知x/y=2,求 [x^2-xy+3xy^2 ] / [ x^2+xy+6y^2]的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
[3xy(1-x)-6xy(x-1/2)]*2x*(-xy)平方,x=-1 y=2 ; 3xy平方(-1/3x平方y+4
(1)已知x+y=6,xy=-3,x^2y+xy^2=
已知x+y=6,xy=-3,则x^2y+xy^2=?