作业帮1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/29 18:09:32
1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
嗯,原式=2（1/8+1/24+1/48+1/80）+2（1/15+1/35+1/63）+1/3
=2[1/（2*4）+1/（4*6）+1/（6*8）+1/（8*10)]+2[1/(3*5)+1/(5*7)+1/(7*9)]+1/3
=[1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10]+[1/3-1/5+1/5-1/7+1/7-1/9]+1/3
=1/2-1/10+1/3-1/9+1/3
=(1/2-1/10)+(1/3-1/9+1/3)
=(5-1)/10+(3-1+3)/9=2/5+5/9=(18+25)/45=43/45
=2[1/（2*4）+1/（4*6）+1/（6*8）+1/（8*10)]+2[1/(3*5)+1/(5*7)+1/(7*9)]+1/3
=[1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10]+[1/3-1/5+1/5-1/7+1/7-1/9]+1/3
=1/2-1/10+1/3-1/9+1/3
=(1/2-1/10)+(1/3-1/9+1/3)
=(5-1)/10+(3-1+3)/9=2/5+5/9=(18+25)/45=43/45
1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=?急啊
2/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80=?
3分之2+8分之2+15分之2+24分之2+35分之2+48分之2+63分之2+80分之2简便运算
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2等于多少
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2=?
2/3+2/15+2/35+2/63+2/99
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
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255 巧算
8-3/2-15/2-35/2-63/2-99/3-143/2-195/2-255/2怎么做!