就是题目那个“和邻居换“弄乱了大家
只要不去想那个邻居就可以了
把题目想象成只有2位主角(买家,店主)
买家给店主100(假)
就等于店主什么都没得到
店主再把79和18元的物品送给了买家
所以答案是
79+18 = 97

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