如果m-(1/m)=-2,那么m^3-【1/(m^3)】= A.-12 B.-14 C.12 D.14
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如果m-(1/m)=-2,那么m^3-【1/(m^3)】= A.-12 B.-14 C.12 D.14
如果m-(1/m)=-2,那么m^3-【1/(m^3)】= A.-12 B.-14 C.12 D.14
如果m-(1/m)=-2,那么m^3-【1/(m^3)】= A.-12 B.-14 C.12 D.14
(m-(1/m))^3=-2^3;
m^3-3*m+3*1/m-(1/m)^3=-8
m^3-(1/m)^3=-8+3*(-2)=-14