1/2+1/6+1/12+1/20+1/30...+1/90简算
2个回答
原式=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+1/8-1/9+1/9-1/10
=1-1/10
=9/10.
相关问题
简算:1/6+1/12+1/20+1/30+.1/72+1/90
简算:1/2+1/6+1/12+1/20+1/30
简算:1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
1/2+1/6+1/12+1/20+1/30怎么简算
1/6+1/12+1/20+1/30+1/42 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
一道六年级分数简算题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?写出简算过程
1/2+1/6+1/12+1/20+1/30+……+1/90=?