3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2-查字典问答网
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来自谈玮的问题

  3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2)]-(3a^2b-8a^2)}=

  3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2)]-(3a^2b-8a^2)}=

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2020-03-2619:41
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  3a^2b-{2a^2b+[9a^2b-(6a^2b+4a^2)]-(3a^2b-8a^2)}

  =3a^2b-2a^2b-[9a^2b-(6a^2b+4a^2)]+(3a^2b-8a^2)

  =a^2b-9a^2b+(6a^2b+4a^2)+3a^2b-8a^2

  =-5a^2b+6a^2b+4a^2-8a^2

  =a^2b-4a^2

2020-03-26 19:45:12
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