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328-76+24=326+2-76+24=326-76+2+24 把328拆成326+2的形式,再用交換律. (1)如果學過負數,接下來這樣算較為簡便: 原式=326-76+(2+24)=326-76+26=326-50=276; (2)如果沒學過負數,則直接計算: 原式=326-76+(2+24)=326-76+26=250+26=276 .
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