1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42) 用简便方法计算
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1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)用简便方法计算1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)用简便方法计算1/
1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42) 用简便方法计算
1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42) 用简便方法计算
1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42) 用简便方法计算
1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)
=1/2-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-1/6+1/7
=1/7
1/2+1/6+1/12+1/20(简算)
1/2,1/3,5/6,( ),12/6,( )
(1/4+1/6-1/2)×12
(1/4+1/6-1/2)×12
找规律填空:1/12,1/6,1/4,1/3,5/12,1/2,().
简便方法计算:1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)
根据规律填空 1/2,-1/6,1/12,-1/20,1/30,( ),( )
(1)1-1/2-1/6-1/12-1/20-...-1/9900(2)1/2+1/6+1/12+1/20+...+1/9900(3)1/3+1/15+1/35+1/63+...+1/9999
1 3 2 6 4 () () 12 ()
1/2+1/6+1/12+1/20+1/30+1/42(简便运算)
计算 1/2+ 1/6+ 1/12+ 1/20+1/30 +1/42 的值.( )
1-1/2-1/6-1/12-1/20-…-1/(99*100)经过
1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42) 用简便方法计算
-12*(2又1/4-1又1/2+1又1/6-1又1/12)
(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)
1.1/2-1/6-1/12-1/20-1/30-1/422.1-1/2-1/6-1/12-1/20-…-1/(2003*2004)
(1/4+1/6-1/2)除以(-1/12)等于多少?