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数学
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如图,在梯形ABCD中,AB∥CD,AB=60,CD=15,E.F分别为AD,BC上的点,且EF∥AB.若梯形DEFC∽梯形EABF,则EF=______.
人气:119 ℃ 时间:2020-01-28 10:04:45
解答
如图:在梯形ABCD中,AB∥DC,AB=60,DC=15,E,F分别是腰AD,BC上的点,且EF∥AB,
∵梯形DEFC∽梯形EABF.
∴
EF
AB
=
CD
EF
,即EF
2
=AB•CD=60×15=900,
∴EF=30.
故答案为:30.
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