题目内容

我会填。
34+8=42,42-7=35。→  34+8-7
                                      =42-7
                                      =35
(1)47-12=35,35-30=5 (2)15-7=8,8+23=31 (3)17+7=24,24+16=40
(1)47-12-30
         =35-30
         =5 
(2)15-7+23
         =8+23
         =31
(3)17+7+16
          =34+16
          =40
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