6a²b-3a(bc+4ab)先去括号,再和并同类项

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6a²b-3a(bc+4ab)先去括号,再和并同类项

6a²b-3a(bc+4ab)先去括号,再和并同类项
6a²b-3a(bc+4ab)先去括号,再和并同类项

6a²b-3a(bc+4ab)先去括号,再和并同类项
6a²b - 3a(bc + 4ab)
= 6a²b - 3abc - 12a²b
= -6a²b - 3abc

=6a²b-(3abc+12a²b)
=6a²b-3abc-12a²b
=-6a²b-3abc
=-3ab(2a+c)