|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+```+|1/100-1/98|说明为什么这样做,

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 [2^4+1/4)(4^4+1/4)(6^4+1/4)(8^4+1/4)(10^4+1/4)】/[1^4+1/4)(3^4+1/4)(5^4+1/4)(7^4+1/4)(9^4+1/4)] 2/1+4/1+4/1+6/1+8/1+16/1+32/1=? 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- 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+1/2+4+1/2+4+6+1/2+4+6+8+.+1/2+4+6+8...+20 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 ( ) ( ) ( ) 计算 1/2*4+1/4*6+.1/2006*2008 1/2*4+1/4*6+...+1/2012*2014=? 1/2*4+1/4*6+.+1/2008*2010 (1/4+1/2+1/6)×1/24等于什么? 简算：24×(1/2+1/3-1/4-1/6) （1/2+1/3+1/4+1/6）*24