用绳测井深,把绳3折,井外余 2米;把绳4折,还差1米不到井口,问井深多少米?绳长多少米?'X.j-a;^4\;y
算式:提示*~(^9v5e)p(t6V6_'X.j-a;^4\;y
答:井深4I1H3a'z7k/x1K)I6a(p.x(N*}0m9l,G米,绳子长9f0n+p0z)M'U米。'X.j-a;^4\;y