期中数学
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/23 20:46:09
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解题思路: 主要利用互为反函数的两个函数之间的对称关系解决本题,函数y=lgx和y=10x 的图象关于直线y=x 对称, 方程lgx+x=3的解就是函数y=lgx和y=3-x图象交点的横坐标,同理,方程10x+x=3的解就是函数y=10x和y=3-x图象交点的横坐标,又直线y=3-x和y=x互相垂直,根据对称性可得,x1+x2就是直线y=3-x和y=x交点的横坐标的二倍.
解题过程:
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最终答案:略
解题过程:
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最终答案:略