所示的梯形ABCD,AD∥BC,AD = 2,AB = 9,CD = 6,BC = 7,EF∥BC,和梯形EBCF AE
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所示的梯形ABCD,AD∥BC,AD = 2,AB = 9,CD = 6,BC = 7,EF∥BC,和梯形EBCF AEFD梯形的周长等于EF所需的长度.
![所示的梯形ABCD,AD∥BC,AD = 2,AB = 9,CD = 6,BC = 7,EF∥BC,和梯形EBCF AE](/uploads/image/z/8048612-20-2.jpg?t=%E6%89%80%E7%A4%BA%E7%9A%84%E6%A2%AF%E5%BD%A2ABCD%2CAD%E2%88%A5BC%2CAD+%3D+2%2CAB+%3D+9%2CCD+%3D+6%2CBC+%3D+7%2CEF%E2%88%A5BC%2C%E5%92%8C%E6%A2%AF%E5%BD%A2EBCF+AE)
让AE
= X,DF = Y,那么EB = 9-X,FC = 6-Y,∵AD∥EF∥BC,∴AE:EB = DF:FC,即:①X:(9-X)= Y
:(6-y)的,得到的两个梯形的周长相等:②2 + x + y的= 9-7 +6- y,则①,②得到的溶液:X = 6时,y =
4,通过D点AB,平行线,交叉EF,BC在M,N点,那么AD = EM = BN = 2,△DMF∽△DNC,∴分子式:NC = DF:DC,解决:MF
= 10/3,∴ EF = 2 10/3 = 16/3
= X,DF = Y,那么EB = 9-X,FC = 6-Y,∵AD∥EF∥BC,∴AE:EB = DF:FC,即:①X:(9-X)= Y
:(6-y)的,得到的两个梯形的周长相等:②2 + x + y的= 9-7 +6- y,则①,②得到的溶液:X = 6时,y =
4,通过D点AB,平行线,交叉EF,BC在M,N点,那么AD = EM = BN = 2,△DMF∽△DNC,∴分子式:NC = DF:DC,解决:MF
= 10/3,∴ EF = 2 10/3 = 16/3
所示的梯形ABCD,AD∥BC,AD = 2,AB = 9,CD = 6,BC = 7,EF∥BC,和梯形EBCF AE
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