2022高考XN英语周报答案

A由已知可得双曲线C:-y2=1的渐近线方程y=±,因为点P(1,2)在双曲线a2y2=1的一条渐近线上,所以2=1=2.故c=√a 1=,因此右顶点到渐近线的距离d==

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