如图,C是线段ab上一点,且ac等于三分之二ab,d是AB的中点,E是CB的中点,DE为4cm,求AB
如图,C是线段ab上一点,且ac等于三分之二ab,d是AB的中点,E是CB的中点,DE为4cm,求AB
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数学人气:332 ℃时间:2019-11-17 22:56:58
优质解答
ac-ad+cb-ce=4cm 2/3-1/2+(2/3-1/2)-2/3*1/2=1/3=4cm 则ab=12cm
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