答案
安徽省2023届高三上学期第一次模拟测试数学参考答案1.B2.A3.D4.C5.A6.A7.D8.C9.C10.B11.A12.A13.1114.115.(kπ6−π18,0)(k∈Z)16..17.(Ⅰ)由题意,解得.(3分)(Ⅱ)这些应聘者笔试成绩的平均数为.(7分)(Ⅲ)根据题意,录取的比例为0.75,(8分)设分数线定为,根据频率分布直方图可知,(9分)且,(10分)解得.故估计应该把录取的分数线定为65分.(12分)18.(1)解:连结EB,在中,,由余弦定理可得,,所以同时可得,,又由五边形内角和可求得所以,进而四边形BCDE为等腰梯形过点C作CM⊥BE于M,可求得进而(2)解:,...
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