/2*5+1/5*8+1/8*11+...+1/2003*2006
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/2*5+1/5*8+1/8*11+...+1/2003*2006/2*5+1/5*8+1/8*11+...+1/2003*2006/2*5+1/5*8+1/8*11+...+1/2003*2006=
/2*5+1/5*8+1/8*11+...+1/2003*2006
/2*5+1/5*8+1/8*11+...+1/2003*2006
/2*5+1/5*8+1/8*11+...+1/2003*2006
=1/3*((1/2-1/5)+(1/5-1/8)+(1/8-1/11)+...+1/2003-1/2006)
=1/3*(1/2-1/2006)
=1/3*(501/1003)
=167/1003
1/2*5+1/5*8+1/8*11+1/11*14+.+1/17*20=?
1/2*5+1/5*8+1/8*11+1/11*14+1/14*17
2*5分之1+5*8分之1+8*11分之1+11*14分之一+
1/3*5+1/5*8+1/8*11+.+1/98*101123错了 应该是 1/2*5+1/5*8+1/8*11+...+1/98*101
8/3+5/8×1/2+11/16
3/8+8/5×1/2+11/16
1/2*5+1/5*8+1/8*11+.+1/2006*2009+1/2009*2012
1/2×5+1/5×8+1/8×11+.+1/2006×2009+1/2009×2012
1/2*5+1/5*8+1/8*11+...+1/2006*2009+1/2009*2012
2*5/1+5*8/1+8*11/1+...+2006*2009/1+2009*2012/1
数学题1/2*5+1/5*8+1/8*11+...+1/2003*2006
(1/2)*5+(1/5)*8+(1/8)*11+(1/11)*14+(1/14)*17+(1/17)*20
24点3则:11,11,1,5;8,5,2,7;1,4,5,6.
-48×(1/2-5/8+1/6-11/16)
/2*5+1/5*8+1/8*11+...+1/2003*2006
1/2*5+1/5*8+1/8*11+1/11*14+1/14*17=?这些题怎样算?
-48×(1/2-5/8+3/1-16/11)-48×(1/2-5/8+1/6-11/16)
找规律填空 5,8,11,15( ) 1,1,2,3,5,8( ),21