t = ax+b (a≠0) として
 f(x) = 2{1+P_3(t)}
 F(x) = 2{1+P_9(t)} = 2{1+P3(P3(t))},
 G(x) = 2{1+P_8(t)} = 1{1+P2(P2(P2(t)))},
 H(x) = 2{1+P_11(t)},