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2a-[-3b+4a-(3a-b)
人气：377 ℃ 时间：2020-02-02 18:28:46
解答
2a-[-3b+4a-(3a-b)]
=2a+3b-4a+(3a-b)
=-2a+3b+(3a-b)
=-2a+3b+3a-b
=a+2b
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