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如图,直线AB、CD交于点O,则(1)若∠1+∠3=68°,则∠1= °.(2)若∠2:∠3=4:1,则∠2= ;(3)若∠2-∠1=100°,则∠3= .
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教案备课库《六年级下学期暑假验收试题数学7年数学组》真题及答案
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