x^2-xy=-3,2xy-y^2=-8,x^2+xy-y^2值是多少x^2-xy=-3,2xy-y^2=-8,求x^2+xy-y^2的值以及2x^2+4xy-3y^2的值
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x^2-xy=-3,2xy-y^2=-8,x^2+xy-y^2值是多少x^2-xy=-3,2xy-y^2=-8,求x^2+xy-y^2的值以及2x^2+4xy-3y^2的值
x^2-xy=-3,2xy-y^2=-8,x^2+xy-y^2值是多少
x^2-xy=-3,2xy-y^2=-8,求x^2+xy-y^2的值以及2x^2+4xy-3y^2的值
x^2-xy=-3,2xy-y^2=-8,x^2+xy-y^2值是多少x^2-xy=-3,2xy-y^2=-8,求x^2+xy-y^2的值以及2x^2+4xy-3y^2的值
x^2-xy=-3(a)
2xy-y^2=-8(b)
(a)式+(b)式得x^2+xy-y^2=-11(c)
(a)式+2*(b)式+(c)=2x^2+4xy-3y^2=-30
(-3x^y+2xy)-( )=4x^+xy
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[-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算
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当x-y=2xy时,求4x-3xy-4y/xy
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
( )*3xy=6x^2y+2xy^2
2xy+5y^2+( )=x^2+3xy
( )-(x^2+3xy)=-xy-1/3y^2
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xy^2=-3,求-xy(x^2y^5-xy^3-y)
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