题目内容
假设： (1) 函数y=f(x)(0≤x＜+∞)满足条件f(0)=0和0≤f(x)≤ex-1； (2) 平行于y轴的动直线MN与曲线y=f(x)和y=ex-1分别相交于点P1和P2； (3) 曲线y=f(x)、直线MN与x轴所围封闭图形的面积S恒等于线段P1P2的长度．求函数y=f(x)的表达式．
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