摘要: 计算: (- )· 解:解法一:原式=· - · ·············· 2分 =· - ······ 4分 =2·- ················ 6分 =2+2-+1····················· 7分 =+3 ······················· 8分 解法二:原式=· ··············· 3分 =· ···················· 5分 = ······················· 6分 =+3 ··························· 8分

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