1/2+1/6+1/12+1/20+1/30+1/42=?
4个回答
1/6=1/2-1/3
1/12=1/3-1/4
1/20=1/4-1/5
1/30=1/5-1/6
1/42=1/6-1/7
1/2+1/2-1/7=6/7
这叫裂项求和
相关问题
1/2-1/6-1/12-1/20-1/30-1/42
1/2+1/6+1/12+1/20+1/30+1/42=
计算-1/2-1/6-1/12-1/20-1/30-1/42
1/6+12/1+20/1+30/1+42/1=
1/6+1/12+1/20+1/30+1/42
1/6+1/12+1/20+1/30+1/42
1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?