作业帮8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
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8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
=8-(1-1/3)-(1/3-1/5)-(1/5-1/7).-(1/15-1/17)
=8-1+1/3-1/3+1/5-1/5.-1/15+1/17
=8-1+1/17=7+1/17
=120/7
原式=8-（3-1）/（1*3）-（5-3）/（3*5）-（7-5）/（5*7）-……-（17-15）/（15*17）
=8-1+1/3-1/3+1/5-1/5+1/7-……-1/15+1/17
=7+1/17
=120/17
1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
2/3+2/15+2/35+2/63+2/99
2/3 4/15 6/35 8/63 求通项公式.
2/3+2/15+2/35+2/63=?
2/3+2/15+2/35+2/63简便运算
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255 巧算8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255 巧算
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=过程详细点
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=?
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/256简算
8-3/2-15/2-35/2-63/2-99/3-143/2-195/2-255/2怎么做!
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2=?
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2等于多少
2/15+2/35+2/63+2/99+2/143
简便计算：3/2+15/2+35/2+63/2+99/2+143/2
2/3+2/15+2/35+2/63+2/99+2/143=?
2/3+2/15+2/35+2/63+2/99+2/132
3/2+15/2+35/2+63/2+99/2+132/2的简便算法