1+1/2+1/6+1/12+1/20+1/30.+1/90
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/22 08:59:03
1+1/2+1/6+1/12+1/20+1/30.+1/90
1+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
1+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
![1+1/2+1/6+1/12+1/20+1/30.+1/90](/uploads/image/z/2843423-71-3.jpg?t=1%2B1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30.%2B1%2F90)
1+1/2+1/6+1/12+1/20+1/30+.+1/90
=1+1-1/2+1/2-1/3+1/3-1/4+.+1/9-1/10
=2-1/10
=1又9/10
=1+1-1/2+1/2-1/3+1/3-1/4+.+1/9-1/10
=2-1/10
=1又9/10
1+1/2+1/6+1/12+1/20+1/30.+1/90
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+.1/9900
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/10
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
谁能巧算1-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90
1/2+1/6+1/12+1/20+1/30+.+1/90
1/2+1/6+1/12+1/20+.+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30+……+1/90=?
简便计算1-2 / 1-6 / 1-12 / 1-20 / 1-30 / 1.-90 / 1
1/2+1/6+1/12+1/20+…+1/72+1/90简算
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1等于多少
2\1-6\1-12\1-20\1-30\1-42\1-56\1-72\1-90\1