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-
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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