1/12+1/20+1/30+1/42+.+1/2450
1个回答
原式=1／(3×4)+1／(4×5)+、、、+1／(49×50)
=(1／3-1／4)+(1／4-1／5)+、、、+(1／49-1／50)
=1／3-1／50
=47／150
相关问题
1.1/2+1/6+1/12+1/20+.+1/2450=
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又1/2-1/12-1/20-1/30-1/42
1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42=
简算1/12+1/20+1/30+1/42+1/56
1/6+1/12+1/20+1/30+1/42 简算