... Trang 48 a) (- 6, 37 . 0, 4) . 2,5 = - 6, 37 . (0 ,4 . 2, 5) = - 6, 37 . 1 = - 6, 37 b) (- 0,12 5) . (- 5, 3) . 8 = (- 0,125 . 8) . (- 5, 3) = (- 1) . (- 5, 3) = 5,3 Bài 98 SGK) Trang 48 GV :Hoa Thị ... = + = 2 (3 ) 3 .(3 ) 1 (3 ) 3.9 1 (3 ) 28fff= += +=2 (1 ) 3 .(1 ) 1 4f = + =B ài 25 SGK trang 64 ( ) ( ) ( ) ( ) 221 3 1 1 3 1 43 3 3 1 3.9 1 28ff= + ... hàm số 2 ( ) 2y f x x= = . TÝnh:22222 (2 ) 2 2 2 (1 ) 1 2 1 (0 ) 0 2 2 ( 1) ( 1) ( 1) 2 1 ( 2) ( 2) 2 2fffff= − == − = −= − = −− = − = − − = −− = − =B ài 30 SGK trang 64 a) đúngB...