1/2×5+1/5×8+1/8×11+.+1/2006×2009+1/2009×2012
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1/2×5+1/5×8+1/8×11+.+1/2006×2009+1/2009×20121/2×5+1/5×8+1/8×11+.+1/2006×2009+1/2009×20121/2×5+1/5×8+
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
=1/3×(1/2-1/5)+1/3×(1/5-1/8)+1/3×(1/8-1/11)+……+1/3×(1/2009-1/2012)
=1/3×(1/2-1/5+1/5-1/8+1/8-1/11+……+1/2009-1/2012)
=1/3×(1/2-1/2012)
=335/2012
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
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
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
2*5分之1+5*8分之1+8*11分之1+11*14分之一+
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
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+1/11*14+1/14*17=?这些题怎样算?
-48×(1/2-5/8+1/6-11/16)
/2*5+1/5*8+1/8*11+...+1/2003*2006
-48×（1/2-5/8+3/1-16/11)-48×(1/2-5/8+1/6-11/16)
24点3则：11,11,1,5；8,5,2,7；1,4,5,6.
1/2 × 1/5 ＋ 1/5 × 1/8 ＋ 1/8 × 1/11 ＋ 1/11 × 1/14 ＋ 1/14 × 1/17