来自兰鹏的问题
其题为:1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
其题为:
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
1回答
2020-03-24 18:57
其题为:1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
其题为:
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?这道题在观察的基础上,将其拆分、合并:可观察到:数列1/2.1/6.1/12.1/20.1/30.中的2.6.12.20.30等等,有规律为:1*2=2,2*3=6,3*4=12,4*5=20,5*6=30.;那么原式...