黑龙江省哈尔滨师范大学附属中学2022-2023学年高三9月月考数学答案
2022.9月考参考答案一选择题题号123456789101112答案BCAADDDCABACDBCBC三、填空题13、14、15、16、四、解答题17、(本题满分10分)解:(1)定义域为,令,,所以的增区间为,减区间为(2),由已知且18、(本题满分12分)解:(1)由已知可得所以=(2)由可得,则。因为所以又19、(本题满分12分)解:(1)若选①;在中,因为故由可得由正弦定理得,即,则,又,故.选②∴∴.321144339(,4)]4、()ln(1),fxxx1(1,),'()11fxx'()010fxx'()00fxx()fx(1,0)(0,...
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