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m3n-m2n2+mn3,
=mn(m2-mn+n2),
=mn[(m2+2mn+n2)-3mn],
=mn[(m+n)2-3mn],
当m+n=3,mn=
时,原式=
(32?3×
)=4
.
=mn(m2-mn+n2),
=mn[(m2+2mn+n2)-3mn],
=mn[(m+n)2-3mn],
当m+n=3,mn=
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