(4-4题45题) 4-4(1) k=7 4-4(2) 44(3) 10 1.707 -0.293 -0.9 0.88 Root Locu Root LocuS 4-5(1) 45(2) -4.236 n=士135°（4-4题~4-5题） -0.88 j 10 k =7 -0.293 -1.707 -0.9 -4.236 o  p =± 135 o  p =0