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【OG20-P273-237题】
In the figure above, point D is on AC. What is the degree measure of ∠BAC ?
(1) The measure of ∠BDC is 60°.
(2) The degree measure of ZBAC is less than the degree measure of ∠BCD.
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条件1:∠BAC=∠BDC-∠ABD=40°,充分
条件2:∠BAC<∠BCD,具体大小未知,不充分
题目讨论 (5条评论)

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jianfengai
那个20°的条件是可以用的啊
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0 回复 2020-08-23 15:36:03
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364787fxra
条件二zbac是什么意思
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0 回复 2020-08-21 10:08:17
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1277528tdqt
这道题简单,有了1,可以推出BAC是40度,充分条件选A
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0 回复 2020-06-11 00:04:54
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Michaele
(1) 1难道不是充分条件吗
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0 回复 2019-11-12 17:22:31
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小新酱
(1)已知角BDC是60度, so 角DBC + 角C = 180度 - 60度 =120度 so,角ABD + 角DBC +角C =20 +120 =140 so, 角A =180-140
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0 回复 2019-03-03 11:28:28