36(a+b)(a-b)(x+y)-21(a+b)(a-2b)(x+y)提取公因式

来源：学生作业帮助网编辑：作业帮时间：2024/05/06 08:49:36

36(a+b)(a-b)(x+y)-21(a+b)(a-2b)(x+y)
=3(a+b)(x+y)[12(a-b)-7(a-2b)]
=3(a+b)(x+y)[5a+2b]
公因式为3(a+b)(x+y)

36(a+b)(a-b)(x+y)-21(a+b)(a-2b)(x+y)=3（a+b)(x+y)[12(a-b)-7(a-2b)=3(a+b)(x+y)(5a+2b)

36(a+b)(a-b)(x+y)-21(a+b)(a-2b)(x+y)
=3(a+b)(x+y)[12(a-b)-7(a-2b)]
=3(a+b)(x+y)(12a-12b-7a+14b)
=3(a+b)(x+y)(5a+2b)

3(a+b)(x+y)[12（a-b)-7(a-2b)]
=3(a+b)(x+y)(5a+2b)

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