全民焦虑:如何赚钱,为什么赚不到钱? ehmp/http://tieba.baidu.com/mo/q/%63%68%65%63%6b%75%72%6c?%75%72%6c=%68%74%74%70%73%3a%2f%2fwww.baidu.com/link?url=Ahm3ymbZS6zeEiQt99Vcb0dFyJJsNbyaXvuXdSdHn57&wd=&eqid=c65cfa17000106bb000000025dd79885?rJvZz
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XL 这题用结合律 做法如下所示: 87+69-78+60+37-28+54-45 =(87-78)+(69+60)+(37-28)+(54-45) =9+129+9+9 =129+27 =156