用绳子测井深,用三折去测,外面余三米,用四折去测,外面剩一米,求井长和绳长多少米?/}0[7|,b,[(_
解:
算式:提示1J(d5^-w*q6z-K4V;{1p/}0[7|,b,[(_
答:井长6{:v)K6f(R.q4}8^9t)w9@8V*y,g4e6m2r9A米,绳长/h3O:}-I-Y:Y0_4K米。/}0[7|,b,[(_