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设计作品2984809
题号 1 2 3 4 5 6 7 8 9 10 答案 B C A D D B C B D D 二、填空题(本大题共5个小题,每空3分,共18分) 11. false. 12. 如果两个角相等,那么它们的余角也相等. 13. 4. 14. 5,75° 15. 52.5° 三、解答题(本大题含8个小题,共72分)
16.(本题8分)
(1)解:原式false ··· ·········· ············ ···································(2分) =false ····· ·························································(4分) 解:原式 =false ··· ·········· ············ ·····················
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