1/6+1/12+1/20+1/30+1/42+1/56++1/72+1/81+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:2024/07/17 21:09:55
1/6+1/12+1/20+1/30+1/42+1/56++1/72+1/81+1/90
![1/6+1/12+1/20+1/30+1/42+1/56++1/72+1/81+1/90](/uploads/image/z/12712942-46-2.jpg?t=1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%2B%2B1%2F72%2B1%2F81%2B1%2F90)
=1/(2+3)+1/(3+4)+1/(4+5).
=1/2-1/3+1/3-1/4+...+1/9-1/10
=1/2-1/10
=2/5
=1/2-1/3+1/3-1/4+...+1/9-1/10
=1/2-1/10
=2/5
1/6+1/12+1/20+1/30+1/42+1/56++1/72+1/81+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
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110 急!
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
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简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=