出纳员手里有面额为2元、5元的纸币，现要付出27元，共有多少种付法？______．
juntaojiang2022-10-04 11:39:541条回答
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tjqdqqmm 共回答了16个问题 |采纳率81.3%- 解题思路：出纳员手中有票面为2元、5元的纸币，现要付出27元钱，就要把27转化为5的倍数与2的倍数的和，然后分类讨论，确定具体的付法．
共有3种付法．分别是：
（1）5张5元，1张2元；
（1）3张5元，6张2元；
（3）1张5元，11张2元．
故答案为：3．点评：
本题考点： 筛选与枚举．
考点点评： 在本题中27只能是5的倍数与2的倍数的和，由此将27裂项即可． - 1年前
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