3(m+1)^2+4(m+1)(m-1)-7m(m-1)
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3(m+1)^2+4(m+1)(m-1)-7m(m-1)3(m+1)^2+4(m+1)(m-1)-7m(m-1)3(m+1)^2+4(m+1)(m-1)-7m(m-1)原式=3m的平方+6m+3+4m
3(m+1)^2+4(m+1)(m-1)-7m(m-1)
3(m+1)^2+4(m+1)(m-1)-7m(m-1)
3(m+1)^2+4(m+1)(m-1)-7m(m-1)
原式=3m的平方+6m+3+4m的平方-4-7m的平方+7m
=13m-1
3(m+1)^2+4(m+1)(m-1)-7m(m-1)
=3(m^2+2m+1)+4(m^2-1)-7m^2+7m
=3m^2+6m+3+4m^2-4-7m^2+7m
=13m-1
3(m+1)^2+4(m+1)(m-1)-7m(m-1)
=9m^2+6m+3+4m^2-4-7m^2+7m
=6m^2+13m-1
=13M-1
3(m+1)^2+4(m+1)(m-1)-7m(m-1)
=3(m^2+2m+1)+4(m^2-1)-7m^2+7m
=3m^2+6m+3+4m^2-4-7m^2+7m
=13m-1
原式=3(m^2+2m+1)+4(m^2-1)-7m^2+7m=3m^2+6m+3+4m^2-4-7m^2+7m=13m-1
解:
上式= 3(m^2+2m+1)+4(m^2-1)-7(m^2-m)
=3m^2+6m+3+4m^2-4-7m^2+7m
=13m-1
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