8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/256简算
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8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/256简算
![8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/256简算](/uploads/image/z/2572407-63-7.jpg?t=8-2%2F3-2%2F15-2%2F35-2%2F63-2%2F99-2%2F143-2%2F195-2%2F256%E7%AE%80%E7%AE%97)
最后一个减数应该是2/255吧
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
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
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=
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!
2/15+2/35+2/63+2/99+2/143
3Q,怎么简便2/3+2/15+2/35+2/63+2/99+2/143+2/195+2/255+2/323+2/399
15-2/3-2/12-2/35-2/63-2/99-2/143-2/195-2/255=?1又1/3-7/12+9/2
15分之2+ 35分之2+ 63分之2+ 99分之2+ 143分之2+195分之2=?
简便计算:3/2+15/2+35/2+63/2+99/2+143/2
简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
2/3+2/15+2/35+2/63+2/99+2/143=?
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2等于多少