如题所述
(ä¸åååä¹ä¸åå
«åä¹ä¸å åäºåä¹ä¸)ä¹(è´ä¸åä¸åä¹ä¸)
=ï¼7/4-7/8+7/12)Ãï¼-8/7ï¼
=-7/4Ã8/7+7/8Ã8/7-7/12Ã8/7
=-2+1-2/3
=-1å2/3
=ï¼7/4-7/8+7/12)Ãï¼-8/7ï¼
=-7/4Ã8/7+7/8Ã8/7-7/12Ã8/7
=-2+1-2/3
=-1å2/3
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第1个回答 2013-08-07
(7/4-7/8+7/12)*(-8/7)=(7/8+14/24)*(-8/7)=(35/24)*(-8/7)=-(5/3)