Yahoo Answers: Answers and Comments for S1_Mock1_15_E [數學]
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From Alex
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Sat, 17 Jan 2015 15:41:50 +0000
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Yahoo Answers: Answers and Comments for S1_Mock1_15_E [數學]
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https://hk.answers.yahoo.com/question/index?qid=20150117000051KK00049
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From 泉路: (1)
Let BE=CE=Y
Let DF be 3X, then CF=X
Are...
https://hk.answers.yahoo.com/question/index?qid=20150117000051KK00049
https://hk.answers.yahoo.com/question/index?qid=20150117000051KK00049
Sat, 17 Jan 2015 23:56:25 +0000
(1)
Let BE=CE=Y
Let DF be 3X, then CF=X
Area of ABE = 4xy/2 = 2 > xy=1
Area of ADF = (3x)(2y)/2 = 3xy = 3(1) = 3
Area of CEF = xy/2 = 1/2
Area of rectangle = (4x)(2y) = 8xy = 8
The required area = 8321/2= 5/2
ANS: B
(2) Coordinates of B = (14, 1) = (3, 1)
Coordinates of C = (3, 2+3) = (3, 5)
ANS: C
(3)Volume of the metal balls = 15 x 15 x (75) = 450
The required volume = 450/3 = 150
ANS: A