=x^4-2y^4-3xy^2+yx^2+2xy^2+3y^4
=x^4+y^4+yx^2-xy^2
=15+(-3)
=12
若x^4+y^4=15,x^2y=-3,求x^4-2y^4-3xy^2+x^y+2xy^2+3y^2的值
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