Question

小光想用长绳测试井深当他将绳子对折时,此时绳子比井深长出6米,当他将绳子再次对折时,此时绳子比井深长1米,井深多少米?绳

Answer 1

设 绳长x,

x=(6-1)/(1/2-1/4)=20;

井深=20/2-6=4