-3ab(2a²-a²b³-5)这道题怎么解答,

-3ab(2a²-a²b³-5)这道题怎么解答,
-3ab(2a²-a²b³-5)这道题怎么解答,

-3ab(2a²-a²b³-5)这道题怎么解答,
-3ab(2a²-a²b³-5)
=﹣3ab*2a²－(﹣3ab)*a²b³－5*(﹣3ab)
=﹣6a³b＋3a³b⁴＋15ab

如图步骤