4-13(1) 4-13 (2) 1.69 0.434 G′(s)= k(s+2) S(s2+2s+3 G(S) k(S+10) s(S+1)(S+2) Root Locus ROOT Locus 4(1) 4-14(2) 8.47 b(s+4) G(s)= 30b (S+2)2 sG(s)= S(S+40（4-13题~4-14题） s(s 2s 3) k(s 2) G (s) 2 + + + ′ = s(s 1)(s 2) k(s 10) G (s) + + + ′ = -0.434 j1.69 7 6 k = -8.47 2 2 (s 2) 4 b(s 4) G (s) + + + ′ = s(s 40) 30b G (s) + ′ =