(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)

来源：学生作业帮编辑：灵鹊做题网作业帮分类：数学作业时间：2024/05/29 12:23:39

(1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42)
=1/3-[(1/6)+(1/12)+(1/20)+(1/30)+(1/42)]
=1/3-[1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6]
=1/3-[1/2-1/6]
=1/3-[3/6-1/6]
=1/3-2/6
=1/3-1/3
=0

1/6+1/12+1/20+1/30+1/42 (1/3)-(1/6)-(1/12)-(1/20)-(1/30)-(1/42) 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1\20+1/30+1/42+.+1/9900=? 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 简算 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= 1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少 1/2+1/6+1/12+1/20+1/30+1/42+1/56简算, 1/6+1/12+1/20+1/30+1/42+1/56+.+1/9900