1/2+1/6+1/10+1/12+1/20+1/30+1/42+.+1/2008*20091/2+1/6+1/10+1/12+1/20+1/30+1/42+.1/2008*2009=?要用简便方法计算
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1/2+1/6+1/10+1/12+1/20+1/30+1/42+.+1/2008*20091/2+1/6+1/10+1/12+1/20+1/30+1/42+.1/2008*2009=?要用简便方法计算
1/2+1/6+1/10+1/12+1/20+1/30+1/42+.+1/2008*2009
1/2+1/6+1/10+1/12+1/20+1/30+1/42+.1/2008*2009=?要用简便方法计算
1/2+1/6+1/10+1/12+1/20+1/30+1/42+.+1/2008*20091/2+1/6+1/10+1/12+1/20+1/30+1/42+.1/2008*2009=?要用简便方法计算
1-1/2+1/2-1/3+1/3-1/4+1/4 -1/5+1/5-1/6+1/6-1/7+.+1/2008-1/2009=1-1/2009=2008/2009
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
1/2+1/4+1/6+1/8+1/10+1/12等于多少?
1/2+1/4+1/6+1/8+1/10+1/12如何计算?简便运算
(1/2+1/4+1/6+1/10+1/12+1/60)/(1+1/3+1/5+1/10+1/15+1/30)
1/2+1/6+1/10+1/12+1/20+1/30+1/42+.+1/2008*20091/2+1/6+1/10+1/12+1/20+1/30+1/42+.1/2008*2009=?要用简便方法计算
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算)
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=?简便计算方法
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=?简算
1/2+1/6+1/12+1/20.+1/380
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2-1/6-1/12-1/20-...-1/110
1/2,-1/6,1/12,-1/20,1/30
2/1+6/1+12/1+24/1+48/1
1/2+1/6+1/12+1/20+.1/90
2/1+6/1+12/1+20/1+...+2450/1
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20)快
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20)=