1/2*2-1+1/4*4-1+1/6*6-1+...+1/50*50-1
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1/2*2-1+1/4*4-1+1/6*6-1+...+1/50*50-1
1/2*2-1+1/4*4-1+1/6*6-1+...+1/50*50-1
1/2*2-1+1/4*4-1+1/6*6-1+...+1/50*50-1
写的不清楚 按你上面写的答案是0 二分之一乘以二就是一 1-1=0
0
1/2*2-1+1/4*4-1+1/6*6-1+...+1/50*50-1
1,2,4,6,
|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+```+|1/2008-1/2006|
1/2+1/4+1/6+1/8+.1/n
(1- 1/100)(1- 1/99) .....(1- 1/4)(1- 1/3)(1- 1/2) (-1 1/2)*(-1 1/3)*......(-1 1/6)*(-1 1/7)
1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
巧算:(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=====
1/2+1/2+4+1/2+4+6+.+1/2+4+6+...+100
1/2,1/4,
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 ( ) ( ) ( )
2/1+4/1+4/1+6/1+8/1+16/1+32/1=?
((1/2)-1)*((1/3)-1)*((1/4)-1)*((1/5)-1)*((1/6)-1)*((1/7)-1)*((1/8)-1)*((1/9)-1)*((1/10)-1)
1+1/2+4+1/2+4+6+1/2+4+6+8+.+1/2+4+6+8...+20
简算:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6
1+1+1+1+11+-1-1-1-1-2-3-4-5-6等于
1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=?
(1/4+1/2+1/6)×1/24等于什么?
简算:24×(1/2+1/3-1/4-1/6)