1/2,1/2,1/4,1/12,( ) a.1/12 b.1/36 c.1/48.1/56
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1/2,1/2,1/4,1/12,()a.1/12b.1/36c.1/48.1/561/2,1/2,1/4,1/12,()a.1/12b.1/36c.1/48.1/561/2,1/2,1/4,1/12
1/2,1/2,1/4,1/12,( ) a.1/12 b.1/36 c.1/48.1/56
1/2,1/2,1/4,1/12,( ) a.1/12 b.1/36 c.1/48
.1/56
1/2,1/2,1/4,1/12,( ) a.1/12 b.1/36 c.1/48.1/56
选C
1/2×1/1=1/2
1/2×1/2=1/4
1/4×1/3=1/12
所以下一个是
1/12×1/4=1/48
c
C
1/2+1/3-1/4除以1/12等于
2/3-【1/12+1/4】=
4,2,1,1/2,1/4,( ) ( ) ( )1/8,1/32,1/4 ,1/16( )( ) ( )1/2,1/6,1/12,1/20,1/30,1/42 ( ) ( ) ( )
1/2+1/3+1/4+1/6+1/12+1/48+1/56
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
1/1*2*3+1/2*3*4+1/3*4*5+.1/11*12*13
1/2,1/2,1/4,1/12,( ) a.1/12 b.1/36 c.1/48.1/56
-12*(2又1/4-1又1/2+1又1/6-1又1/12)
(1/4+1/6-1/2)×12
(1/4+1/6-1/2)×12
12/(1/2-1/3-1/4)=
1/1+2/1-1=2/1 3/1+4/1-2/1=12/1 ...则2011/1+2012/1-多少=2011X2012/1
找规律填空:1/12,1/6,1/4,1/3,5/12,1/2,().
按规律写数:1/12,1/6,1/4,1/3,5/12,1/2,( )
1/2,1/4,
数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式
1/2+1/4+1/6+1/8+1/10+1/12等于多少?
递等式计算 1/2-1/3+1/4-1/5+1/6-1/12