算式：提示.C-s+g5]1g)W1R5|9Z)k0{;U8R7{)m:i5P1L(a;m5D6U
答：两个码头间的距离是,J)x5T0b5z4j2\*W1M4q*h3W千米。;U8R7{)m:i5P1L(a;m5D6U