苏州毅嘉电子车间照片:1/2,3/7,3/8,1/3,...通项公式an是?
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过程!
1/2,3/7,3/8,1/3,...
3/6,3/7,3/8,3/9....
an=3/(n+5)
1/2,3/7,3/8,1/3,...
3/6,3/7,3/8,3/9.... an=3/(n+5)
an=3/(n+5)
4/3,1,2,7,( )
1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8)
(72+1/2)x1/4 和 (28-3/7)x1/7
3/2,2/3,3/4,1/3,3/8,( )
1 8 9 4 1 1/6的排列规律、0 3/2 2/3 5/4 4/5 7/6
1/1+(2/1-1/2)+(3/2-1/2+1/3)+(4/1-3/2+2/3-1/4)+~~~~+(9/1-8/2+7/3-6/4+~~~+1/9)
3/15,1/3,3/7,1/2,( ) A.5/8,B.4/9,C.15/27,D.-3
1/2+1/3+1/4+1/5+1/6+1/7+.......+1/99+1/100=?
1/3 2/5 4/7 ( ) 256/11
71 1/6×6/7+61 1/5×5/6+51 1/4×4/5+41 1/3×3/4+31 1/2×3/2