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1.池塘水面上的浮萍(一种水草),每天增加1倍,50天后整个池塘长满了浮萍,请问:第几天浮萍所占的面积是池塘面积的一半?
1. Duckweed (a kind of aquatic grass) on the surface of the pond is increased by 1 time every day. After 50 days, the whole pond is covered with duckweed. I would like to ask: In the first few days, the area occupied by duckweed is half of the pond area.