Shanghai Tong Unversity1、劳斯判据：例 -0.77±0.9i 5s4+3s3+4s2+6=0 0.47±0.8i 5s4+4s3-2s2+3+5=0 -1±0.4i 0.6t0.68i 534+4s3+252+s+5=0 -0.87±0.7i 0.47±0.76iShanghai Jiao Tong University1. 劳斯判据：例 1. 劳斯判据：例 5 3 4 6 0 4 3 2 s + s + s + = 5 4 2 5 0 4 3 2 s + s − s + s + = 5 4 2 5 0 4 3 2 s + s + s + s + = ‐0.77 ± 0.9i 0.47 ± 0.8i ‐1 ± 0.4i 0.6 ± 0.68i ‐0.87 ± 0.7i 0.47 ± 0.76i