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標題:

ce 99 mc X2

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圖片參考:http://imgcld.yimg.com/8/n/HA07941386/o/701204070033513873390300.jpg thanks a lots 20 POINTS!!!

最佳解答:

50)∠ACT = ∠BTA (∠in alt. segment)∠CAT = ∠CAT (common)△ATB ~ △ACT (A.A.)AT/9 = (16 + 9)/ATAT2 = 9 * 25AT = 15(C) 44)△NAD ~ △NCM So MN : ND = MC : AD = 1 : 2 So △NCD = (2/3) △DMC = (2/3) (1/4)ABCD = (1/6)ABCDABMN = △ABC - △NCM = (1/2)ABCD - (1/3) △DMC = (1/2)ABCD - (1/3) (1/4)ABCD = (5/12) ABCD△NCD : ABMN = (1/6)ABCD : (5/12) ABCD = 1/6 : 5/12 = 2 : 5(D)

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其他解答:5AEEC82B53E1B405

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