Mathematica入门习题[8]–分段函数与纯函数的使用

第八题

Clear["Global`*"]
y[x_] := x^2 + x - 6 /; x < 0 && x != -3;
y[x_] := x^2 - 5*x + 6 /; 0 <= x < 5 && x != 2 && x != 3;
y[x_] := x^2 - x - 1;
y[#] & /@ {-5, -3, -2.5, 0, 1, 2, 2.5, 3, 5}