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问两组数据。。运算过程中可以出现负数吗？ 如 4 = ( 4 1 ) ( 1 2 ) 结果是 4=(4+1)+(1-2) 多余的括号需要去掉吗？ 如 4 = ( 4 (1) ) (( 2 1 )) 结果是 4=(4-(1))+((2-1)) Followed by:
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