1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算

来源：学生作业帮编辑：百度作业网作业帮分类：数学作业时间：2024/05/04 04:48:07

1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/2-1/10
=2/5

1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算两道简便计算的题简便计算：①1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 89×99+1简便计算 48×99+1简便计算简便计算.1题简便计算 126×1/125 简便计算（要求写出简便过程）（1）（56 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算 20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算. 1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算 1/6+1/12+1/20+1/30+1/42+1/56 简便计算计算：1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90（要求简便计算）