作业帮1-(2/15+2/35+2/63+2/99)简便
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1-(2/15+2/35+2/63+2/99)简便
1-(2/15+2/35+2/63+2/99)
简便
1-(2/15+2/35+2/63+2/99)简便
=1-[2/(3*5)+2/(5*7)+2/(7*9)+2/(9*11)]
=1-(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=1-(1/3-1/11)
=1-8/33
=25/33
1-(2/15+2/35+2/63+2/99)简便
1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
(1/15 1/35 1/63 1/99)*2
2/15+2/35+2/63+2/99+2/143
2/3+2/15+2/35+2/63+2/99
2/3+2/15+2/35+2/63=?
2/3+2/15+2/35+2/63简便运算
2/15+2/35+2/63+2/99
2/15+2/35+2/63+.+2/323=
找规律:1/3,-2/15,3/35,-4/63( ),( )
找规律1/3 -2/15 3/35 -4/63
找规律：1/3,-2/15,3/35,-4/63
1/3 -2/15 3/35 -4/63 ( ) ( )
找规律：1/3,-2/15,3/35,-4/63
1/3 -2/15 3/35 -6/63 ( ) ( )
1/3,-2/15,3/35,-4/63,( ),( ),……
2/3+2/15+2/35+2/63+1/9这道题怎样简算?
15/2（15分之2）+35/2+63/2+99/2+143/2=多少,