用简便方法计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
用简便方法计算,1,2题
1/2+1/6+1/12+1/20+1/30+1/42用简便方法计算
用简便方法计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1、用简便方法计算
20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.
1+2+3+4+.20=?用简便方法计算
1/30+1/42+1/56+1/72+1/90 怎么用简便方法计算
1-1/6+1/42+1/56+1/72 要用简便方法计算
1/30+1/42+1/56+1/72(用简便方法计算)
求1/2+1/6+1/12+1/20+1/30+1/42的和(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 用简便方法计算这道题