2/3+2/15+2/35+2/63+2/99+2/143=?
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2/3+2/15+2/35+2/63+2/99+2/143=?
![2/3+2/15+2/35+2/63+2/99+2/143=?](/uploads/image/z/8089785-9-5.jpg?t=2%2F3%2B2%2F15%2B2%2F35%2B2%2F63%2B2%2F99%2B2%2F143%3D%3F)
2/3+2/15+2/35+2/63+2/99+2/143
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+...(1/11-1/13)
=1-1/13
=12/13
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+...(1/11-1/13)
=1-1/13
=12/13
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=?
2/15+2/35+2/63+2/99+2/143
8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
简便计算:3/2+15/2+35/2+63/2+99/2+143/2
8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2=?
3分之2+15分之2+35分之2+63分之2+99分之2+143分之2=?
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!
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
1/3-2/15+3/35-4/63+5/99-6/143=?