1/12+1/20+1/30+1/42+.+1/2450

来源：学生作业帮助网编辑：六六作业网时间：2024/12/25 04:09:47

1/12+1/20+1/30+1/42+.+1/24501/12+1/20+1/30+1/42+.+1/24501/12+1/20+1/30+1/42+.+1/2450原式=1／(3×4)+1／(4×

1/12+1/20+1/30+1/42+.+1/2450
1/12+1/20+1/30+1/42+.+1/2450

1/12+1/20+1/30+1/42+.+1/2450
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

1/6+1/12+1/20+1/30+1/42 1/3-1/12-1/20-1/30-1/42 1／6+1／12+1／20+1／30+1／42 1/12+1/20+1/30+1/42+.+1/2450 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算 1/2+1/6+1/12+1/20+1/30+1/42+1/56简算, 1/12+1/20+1/30+1/42+1/56+1/72+1/90 简便运算：1/2+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的简便计算 2/1+6/1+12/1+20/1+30/1+42/1+56/1=? 1/12+1/20+1/30+1/42+1/56+1/72+1/90 1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算 1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算 1+1/2+1/6+1/12+1/20+1/30+1/42=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56 1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少