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江苏省徐州市高三数学上学期期中抽测试题(扫描版)试题.doc

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江苏省徐州市2018届高三数学上学期期中抽测试题（扫描版）徐州市2017-2018学年度高三年级摸底考试数学I参考答案一、填空题1．SKIPIF1<02．SKIPIF1<03．64．SKIPIF1<05．SKIPIF1<06．SKIPIF1<07．48．SKIPIF1<09．8810．SKIPIF1<011．SKIPIF1<012．SKIPIF1<013．SKIPIF1<014．SKIPIF1<0二、解答题15．（1）因为SKIPIF1<0，由正弦定理，得SKIPIF1<0．················2分因为SKIPIF1<0，所以SKIPIF1<0．即SKIPIF1<0，所以SKIPIF1<0．····························································································4分因为SKIPIF1<0，所以SKIPIF1<0．················································································6分又因为SKIPIF1<0，所以SKIPIF1<0．···············································································7分（2）由余弦定理SKIPIF1<0及SKIPIF1<0得，SKIPIF1<0，即SKIPIF1<0．··································································································10分又因为SKIPIF1<0，所以SKIPIF1<0，····················································································12分所以SKIPIF1<0．·································································14分16.（1）因为SKIPIF1<0平面SKIPIF1<0，SKIPIF1<0平面SKIPIF1<0，平面SKIPIF1<0SKIPIF1<0平面SKIPIF1<0，所以SKIPIF1<0．·························································3分因为SKIPIF1<0平面SKIPIF1<0，SKIPIF1<0平面SKIPIF1<0，所以SKIPIF1<0平面SKIPIF1<0．···························································································6分（2）因为SKIPIF1<0为SKIPIF1<0的中点，SKIPIF1<0，所以SKIPIF1<0为SKIPIF1<0的中点．又因为SKIPIF1<0，所以SKIPIF1<0，············································································8分又SKIPIF1<0，SKIPIF1<0，所以SKIPIF1<0．···························································10分又SKIPIF1<0平面SKIPIF1<0，SKIPIF1<0，所以SKIPIF1<0平面SKIPIF1<0．···························································································12分因为SKIPIF1<0平面SKIPIF1<0，所以平面SKIPIF1<0SKIPIF1<0平面SKIPIF1<0．············································14分17．（1）由题意，SKIPIF1<0，SKIPIF1<0