帮帮

来源：学生作业帮助网编辑：六六作业网时间：2024/11/06 07:35:03

帮帮帮帮帮帮(a-(2b-3c))(a+(2b-3c))a2-4b2-9c2+12bc(a+2b-3c)(a-2b-3c)

帮帮
帮帮

帮帮
(a-(2b-3c))(a+(2b-3c))
a2-4b2-9c2+12bc
(a+2b-3c)(a-2b-3c)

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