题目

口算 489-69=                50×8=              9 × 600= 380-40=                400×4=             39+160= + =                  - =                1- = 答案:489-69=420                50×8=400              9 × 600=5400 380-40=340                400×4=1600             39+160=199 15 + 25 = 35                   89 - 59 = 39                 1- 56 = 16
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