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額,我怎麼覺得同正、同負都可以啊,所以我覺得選項里貌似沒對的 絕對值是正的吧,所以例(-1)*(-2)=2也沒錯啊. 原式=-20-4*7+4*(5/4)+8/17*(-17/4) =-20-28+5-2 =-20+5-30 =-45
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