若x^4+y^4=15,x^2y=-3,求x^4-2y^4-3xy^2+x^y+2xy^2+3y^2
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若x^4+y^4=15,x^2y=-3,求x^4-2y^4-3xy^2+x^y+2xy^2+3y^2
若x^4+y^4=15,x^2y=-3,求x^4-2y^4-3xy^2+x^y+2xy^2+3y^2
若x^4+y^4=15,x^2y=-3,求x^4-2y^4-3xy^2+x^y+2xy^2+3y^2
=x^4-2y^4-3xy^2+yx^2+2xy^2+3y^4
=x^4+y^4+yx^2-xy^2
=15+(-3)
=12
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
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