四川省宜宾市2025届高三第一次诊断性考试数学答案
一诊数学参考答案第1页共5页宜宾市普通高中2022级第一次诊断性测试数学参考答案及评分意见一、选择题题号1234567891011选项ABCCACDBABCACBCD三、填空题:本题共4小题,每小题5分,共20分。12.13.14.四、解答题:本题共小题,共分。解答应写出文字说明,证明过程或演算步骤。15.(13分)(1)证明:连结,在中,,,,,所以,于是,同理可证,又所以平面,又平面,所以平面平面;··························································6分(2)解:取的中点,连结,因为,所以,,所以平面与平面的夹角为,·····...
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