已知m-n=2 则3m^2-6mn+3n^2-9=
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已知m-n=2则3m^2-6mn+3n^2-9=已知m-n=2则3m^2-6mn+3n^2-9=已知m-n=2则3m^2-6mn+3n^2-9=3（m-n）^2-9=3*4-9=33m^2-6mn+3
已知m-n=2 则3m^2-6mn+3n^2-9=
已知m-n=2 则3m^2-6mn+3n^2-9=
已知m-n=2 则3m^2-6mn+3n^2-9=
3（m-n）^2-9=3*4-9=3
3m^2-6mn+3n^2-9
=3（m-n)^2-9
=3*4-9
=3
化简为3（m-n）^2-9=3
3m^2-6mn+3n^2-9
=3(M^2-2mn+n^2)-9
=3(m-n)^2-9
=3*2^2-9
=3
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