我在一所小学教书时,曾给学生们出过这样一道题:用1元钱能买两个桃子,用两个桃核能换一个桃子,假如你有1元钱,能吃到几个桃子。学生们马上异口同声地给出了答案:“能吃到3个桃子。”但有一个学生站起来说:“老师,我能吃到4个桃子。”我挺奇怪,就问他,你怎么弄到第4个。孩子面不改色地说:“当我吃完3个桃子后剩下一个桃核时,可以先借一个桃子,吃完后把两个桃核还给卖桃子的人。”从数学的角度,这个 When I was teaching in a primary school, I had given students a question like this: You can buy two peaches with one dollar and two peaches with one peach. If you have one dollar, you can eat a few peaches . The students immediately gave the answer in unison: “” Three peaches can be eaten. “But one student stood up and said,” Teacher, I can eat four peaches. “I was weird and asked him How did you get the 4th? When the child left a peach kernel after eating three peaches, he could borrow a peach and then return the two peach kernels to the peach seller. ”From the mathematical Angle, this