计算(3m^2)^3-7m^3【m^3-m(4m^2+1)】等于A.7m^3+9m^4B.7m^4+48m^6C.-7m^2+7m^4+31m^5D.-7m^3-28m
计算(3m^2)^3-7m^3【m^3-m(4m^2+1)】等于A.7m^3+9m^4B.7m^4+48m^6C.-7m^2+7m^4+31m^5D.-7m^3-28m^5-7m^6+27m^7正确率一定要高!
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