小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com2025年普通高等学校招生全国统一考试模拟测试（二）数学参考答案一、单项选择题题号12345678答案DCABCBAD二、多项选择题题号91011答案BCBCDACD三、填空题12.13.14.，四、解答题15.解：（1）由余弦定理得，···················································2分所以，····································································4分（没变形但答案正确不扣分）所以.········································································································6分（2）由正弦定理得，······················7分整理得，··································8分（正弦定理与正弦二倍角公式各1分）因为，所以，···9分所以，··············································································10分小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com（化简最后结果正确即可得分）因为，所以，解得，···············································11分所以，·····························································································12分（与都没有扣1分）所以.································································13分（答案正确，面积公式没写不扣分）16.解：（1）由已知得，·································································1分设点，则，且，所以，·······················································································································2分因为，所以，············································3分因为，所以，所以.··········································5分另解：因为，所以，·································3分因为，所以，所以.··································5分（x范围写错，但题目过程思路正确，给3分）（2）解法一：假设四边形是以为对称轴的，则，且的中点在上,···································································6分小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com设，，则，，，···················································································7分（说明M是AC中点，且写出中点坐标关系即可得分）所以，····················································································8分因为点在第一象限，且，所以，········································...