(-9a²b的四次方)(-1/3a²c)
问题描述：
(-9a²b的四次方)(-1/3a²c)
答
(-9a^2b^4)*(-1/3a^2c)
=[(-9)×(-1/3)]*[(a^2b^4)*(a^2c)]
=3a^4b^4c