闻王昌龄左迁龙标遥有此寄

【唐】李白

杨花落尽子规啼，闻道龙标过五溪。

我寄愁心与明月，随君直到夜郎西。

一个圆形蓄水池的周长是25.12m。这个蓄水池的占地面积是多少？

长方体ABCD﹣A₁B₁C₁D₁中，若A₁C与平面AB₁D₁相交于点M，则 $\frac{A_{1}M}{A_{1}C}$ =____．

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