已知m^2+m-11=0 求m^3+12m^2-21
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已知m^2+m-11=0 求m^3+12m^2-21
已知m^2+m-11=0 求m^3+12m^2-21
已知m^2+m-11=0 求m^3+12m^2-21
∵m^2+m-11=0
∴m^2+m=11
m^3+12m^2-21
=m(m^2+m)+11m^2-21
=11m+11m^2-21
=11×(m+m^2)-21
=11×11-21
=121-21
=100
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