比例习题1
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Question 1 of 5
1. Question
1、如图所示，DE与BC平行，已知AD=4,BD=5,DE=16，则BC的长度是多少？
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解答：
(1) AD:( )=4:( )=DE:BC
(2) BC=( )
CorrectIncorrect -
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Question 2 of 5
2. Question
2、如图所示，DE与BC平行，已知AD=4，BD=5，△ADE的面积为32，则四边形DECB面积是多少？
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问题：
(1)
=( ):( )
(2)
=( )(3) 四边形☐DECB面积是( )
CorrectIncorrect -
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Question 3 of 5
3. Question
3、如图所示，梯形ABCD的面积是50，下底是上底长的1.5倍，阴影三角形的面积是多少？
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问题：
(1) 上底与下底的比( ):( )
(2)
=( ):( ):( ):( )
(3) 阴影三角形面积是( )
CorrectIncorrect -
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Question 4 of 5
4. Question
4、如图所示，正方形ABCD的边长是6，E点是BC的三等分点，△AOD的面积是多少？
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问题：
(1) BE:( )=BO:DO=( ):( )
(2)
=( ):( )
(3) 三角形AOD的面积是( )
CorrectIncorrect -
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Question 5 of 5
5. Question
5、如图，平行四边形ABCD面积是12，
，AC与BE的交点为F，那么图中阴影部分面积是多少？
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问题：
(1) 做辅助线，连接( )
(2) AD:BC=( ):( )
(3) 阴影占总面积的( )/( )
(4) 阴影面积是( )
CorrectIncorrect -