计算(3m^2)^3-7m^3【m^3-m(4m^2+1)】等于 A.7m^3+9m^4 B.7m^4+48m^6 C.-7m^2+7m^4+31m^5 D.-7m^3-28m
计算(3m^2)^3-7m^3【m^3-m(4m^2+1)】等于 A.7m^3+9m^4 B.7m^4+48m^6 C.-7m^2+7m^4+31m^5 D.-7m^3-28m^5-7m^6+27m^7 正确率一定要高!
人气：485 ℃ 时间：2019-08-21 11:02:47
解答
答案B
(3m^2)^3-7m^3【m^3-m(4m^2+1)】
=27m^6-7m^3[m^3-4m^3-m]
=27m^6-7m^3[-3m^3-m]
=27m^6+21m^6+7m^4
=48m^6+7m^4
选B
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