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翻译whatever was to have happened, has happened

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翻译whatever was to have happened, has happened
在平面直角坐标系中,正方形OABC的两边OA,OC分别在X轴,Y轴上,以A为顶点经过C的抛物线Y=ax2+bx+c, P(m,0)为x轴上一动点,Q(0,6-m)是y轴上一动点,矩形POQM随m的变化而变化,设其周长是C,与正方形OABC重叠部分的面积是S,求S关于m的函数关系式,矩形POQM与正方形OABC面积相等时m的值?
翻译whatever was to have happened, has happened
过去不论将发生什么,都已经发生了.