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人教社出版的九义小数教材第三册P_(134)有这样一道题: “1+3+5=9 小华很快想出:3×3=9 1+3+5+7+9=25 小华又很快想出:5×5=25 你知道小华是怎样想出的吗?下面的题你能很快想出来吗?
PJ (134), the third volume of the textbook of the Jiuyi School published by Humanities and Social Sciences Publishing House, has such a question: "1 + 3 + 5 = 9 Xiaohua quickly came up with the following formula: 3 × 3 = 9 1 + 3 + 5 + 7 + 9 = 25 Xiaohua quickly figured out: 5 × 5 = 25 Do you know Xiaohua is how to come up with the following questions you can quickly come up with it?