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shi_painters 幼苗
共回答了1536个问题 举报
m3+n3+2m2-2n2+2008
=m^3+m^2+n^3-n^2+m^2-n^2+2008
=m(m^2+m)+n(n^2-n)+m^2-n^2+2008
=m+n+m^2-n^2+2008
=m^2+m-(n^2-n)+2008
=1-1+2008
=2008
=m^3+m^2+n^3-n^2+m^2-n^2+2008
=m(m^2+m)+n(n^2-n)+m^2-n^2+2008
=m+n+m^2-n^2+2008
=m^2+m-(n^2-n)+2008
=1-1+2008
=2008
1年前
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