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如图,直线BD∥EF,AE与BD交于点C,若∠ABC=30°,∠BAC=75°,...
如图,直线BD∥EF,AE与BD交于点C,若∠ABC=30°,∠BAC=75°,则∠CEF的大小为
.
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有意义的实数a的取值范围是
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