g(x) = K1x2
由g(1) = 2,得 K1*12 = 2,那么 K1 = 2;
h(x) = K2/x
由h(1) = 3,得 K2/1 = 3,那么 K2 = 3
所以:f(x) = g(x) + h(x) = 2x2 + 3/x