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