5个7的和比30多______,比4个7多______,比8个7少______
5个7的和比30多______,比4个7多______,比8个7少______....
5个7的和比30多______,比4个7多______,比8个7少______.
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推荐于2016-10-29
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7×5-30 =35-30 =5;
7×5-7×4 =35-28 =7;
7×8-7×5 =56-35 =21; 答:5个7的和比30多5,比4个7多7,比8个7少21. 故答案为:5;7;21. |
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