已知m^2+n^2=3,x^2+y^2=671,求多项式(mx+ny)^2+(nx-my)^2

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已知m^2+n^2=3,x^2+y^2=671,求多项式(mx+ny)^2+(nx-my)^2
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已知m^2+n^2=3,x^2+y^2=671,求多项式(mx+ny)^2+(nx-my)^2
已知m^2+n^2=3,x^2+y^2=671,求多项式(mx+ny)^2+(nx-my)^2

已知m^2+n^2=3,x^2+y^2=671,求多项式(mx+ny)^2+(nx-my)^2