... fa(r)dr]ds,\ftED s (1. 30) Chung minh djnh Iy 1. 9 Tl1ong tl! chung minh dinh 1: 91. 8.(D) Binh 1: 91. 9 t6ng qu:H h6a dinh 1: 91. 8 Binh 1: 91. 8 dl1Qcsuy tu dinh 1: 91. 9 trl1dng hQp a, b 1a cac ham h~ng, Lllqn van thfJc ... b(t) 1: k(s)u(s)ds, b1EQ, (1. 14) thE u(t) ~a(t)+b(t) 1: a(s)k(s)exp[ fb(r)k(r)dr]ds, \1tEQ (1. 15) b) Kef qua a) vdn dung ntu thay dau H~' bJi dau H;?"trang (1. 14) va (1. 15) Luqn van th{lc sf ... tltEQ (1. 21) Mil nganh : 1. 01. 01 11 Mil ri)ng va ung d1!ngBd di Gronwall-Bellman trang crt) Hoang Thanh Long = art) b(t) Chung minh djnh Iy 1. 6 Chia hai v6 cua (1. 20) cho bet), ap dlJngdinh ly 1. 5.(0)...