点C、D在直线AB上,线段AC,CB,AD,DB的长度满足.点C,D在直线AB上,线段AC,CB,AD,DB的长度满足AC:CB=5:4,AD:DB=2:1,且CD=2cm,求线段AB的长.四种答案都要,
问题描述：
点C、D在直线AB上,线段AC,CB,AD,DB的长度满足.
点C,D在直线AB上,线段AC,CB,AD,DB的长度满足AC:CB=5:4,AD:DB=2:1,且CD=2cm,求线段AB的长.四种答案都要,
答
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答
设AB长为 x cm 第一种情况：---------------------------------A C D BAC = 5/(5+4) AB = 5/9 ABAD = 2/(2+1) AB = 2/3 ABCD= AD - AC = (2/3-5/9) AB= 1/9 AB= 2AB=18 cm第二种情况...