延长线ab至C,使bc等于3/1ab,延长bc至d,使cd等于3/1bc,延长cd至e,使de等于3/1cd,若ae等于80米,求ab

问题描述:

延长线ab至C,使bc等于3/1ab,延长bc至d,使cd等于3/1bc,延长cd至e,使de等于3/1cd,若ae等于80米,求ab

AB+BC+CD+DE=AB+1/3AB+1/3AB*1/3+1/3AB*1/3*1/3=80解得AB=54
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