1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算
两道简便计算的题简便计算:①1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 +
89×99+1简便计算
48×99+1简便计算
简便计算.1题
简便计算 126×1/125
简便计算(要求写出简便过程) (1)(56
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便计算
1/6+1/12+1/20+1/30+1/42+1/56 简便计算
计算:1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90(要求简便计算)