1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
4个回答
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
=1-1/2+1/2-1/3+……+1/8-1/9
=1-1/9
=8/9
相关问题
1/2 + 1/6 + 1/12 + 1/20 + 1/30+ 1/42 + 1/56 + 1/72=
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=?
6/1+12/1+20/1+30/1+42/1+56/1+72/1=?
1/6+1/12+1/20+1/30+1/42+1/56+1/72
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=
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
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.计算:1 - 1/2 - 1/6- 1/12 - 1/20 - 1/30 - 1/42 - 1/56 - 1/72