Cut a cylindrical wood with a length of 100cm into 4 small cylinders, the surface area increases by 12cm**2. What is the area of the base of this cylindrical piece of wood?
把一根长100cm的圆柱形木料截成4个小圆柱，表面积增加了12cm**2．这根圆柱形木料的底面积是多少．
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