一条公路旁每隔40米有木电线杆1根，共121根。现在换成水泥电线杆，均匀地立了51根，求两根水泥电线杆间的距离。(B+N;~:_/X4S)Y9|:W,i
算式：提示*o9J:d-O(B+N;~:_/X4S)Y9|:W,i
答：两根水泥电线杆间的距离是4E.l8e*];b1A6y(R6N米。(B+N;~:_/X4S)Y9|:W,i