1/2+1/6+12/1+20/1+30/1+42/1+56/1=?

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/17 11:18:45

1/2+1/6+1/12+1/20+1/30+1/42+1/56
=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1/1+(-1/2+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+0+0+0+0+0+0-1/8
=1-1/8
=7/8

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= 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= 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+.1/132= 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90= 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=多少 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=______ 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+.1/9900=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算