1/2+1/6+1/12+1/20+.1/110=?
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:2024/08/04 18:05:19
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+.+1/(10*11)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/10-1/11
=1-1/11
=10/11
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+.+1/(10*11)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/10-1/11
=1-1/11
=10/11
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=?
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
若a=1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132+1/
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=
2\1+6\1+12\1+20\1+30\1+42\1+56\1+72\1+90\1+110\1+132\1=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
求1/2+1/6+1/12+20/1+30/1+...1/110
计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?用简便运算!
求解小学数学题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1+110/1=?
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1+110/1=几分之几