时间限制: 2s
内存限制: 192MB 提交: 5577 解决: 3027
题目描述
编写程序，计算下列分段函数y=f(x)的值。
y=-x+2.5; 0 <= x < 5
y=2-1.5(x-3)(x-3); 5 <= x < 10
y=x/2-1.5; 10 <= x < 20
输出格式
输出N对应的分段函数值：f(N)。结果保留到小数点后三位。
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