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15问答网 > 用简便计算 7⼀12+9⼀20+11⼀30-13⼀42+15⼀56-17⼀72

用简便计算 7⼀12+9⼀20+11⼀30-13⼀42+15⼀56-17⼀72

2025-02-10 22:03:57

推荐回答（1个）

回答1：

7/12-9/20+11/30-13/42+15/56-17/72
=（1/3+1/4）-（1/4+1/5）+（1/5+1/6）-（1/6+1/7）+（1/7+1/8）-（1/8+1/9）
=1/3-1/9
=2/9 是这样的,因为7/12=1/3+1/4,9/12=1/4+1/5,后面的每一项都可以这样替换

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