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82问答网 > 4⼀7+5⼀21-4⼀7+16⼀21用简便方法怎么算？

4⼀7+5⼀21-4⼀7+16⼀21用简便方法怎么算？

2025-04-02 20:40:40

推荐回答（2个）

回答1：

你好，这个题目的简便方法就是直接利用加法的交换律，把相同分母的数字放在一起，于是就得到4/7-4/7，再加上5/21，再加16/21，最后的结果就等于一。

回答2：

4/7+5/21-4/7+16/21
=4/7-4/7+(5/21+16/21)
=0+21/21
=0+1
=1

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