... + 2x - x2 = - (x2 - 2x + 1)= - (x - 1)2 = a2 - u2, + Vỡ x = u + 1, nờn ta cú dx = du v x + = u + 3, v ú ( x + 2)dx + 2x x2 = a u + 3sin-1 = a2 u2 u = a = udu a2 u2 + 3 + x x + 3sin-1 ( ... p v nh: Trang 280 (bi - 30), trang 282 (bi 13 - 24), Trang 304 ( bi -3 0), trang 308 ( bi - 23), trang 312 (bi - 28), trang 315( bi - 16), trang 321(2 - 13), trang 326 (bi - 25) c tr c cỏc m c: ... m t vi giỏ tr c a t t -2 -1 x 1 y -8 -1 + N i nh ng i m ú ta s c ng cong Cỏch : Kh o sỏt s bi n i c a x v y t bi n Hỡnh 17.1 i dy 3t dt = = t dx 2tdt T - y - x + y - 0 + 0 + + + + Ta cú :...