Question

Đã trả lời bởi chuyên gia

Answer 1

$a, H à m s ố đ ồ n g b i ế n < = > 3 - 9 m > 0 < = > 9 m < 3 < = > m < \frac{1}{3} V ậ y m < \frac{1}{3} b, H à m s ố n g h ị c h b i ế n < = > 3 - 9 m < 0 < = > 9 m > 3 < = > m > \frac{1}{3} V ậ y m > \frac{1}{3} c, T h a y O (0; 0) v à o h à m s ố t a c ó : (3 - 9 m) . 0 + 5 m - 2 = 0 < = > 5 m - 2 = 0 < = > 5 m = 2 < = > m = \frac{2}{5} V ậ y m = \frac{2}{5} d, T h a y A (1; 4) v à o h à m s ố t a c ó : (3 - 9 m) . 1 + 5 m - 2 = 4 < = > 3 - 9 m + 5 m = 6 < = > 3 - 4 m = 6 < = > - 4 m = 3 < = > m = - \frac{3}{4} V ậ y m = - \frac{3}{4}$

$e, H à m s ố c ắ t O y t ạ i y = 3 n ê n t h a y x = 0; y = 3 v à o t a c ó : (3 - 9 m) . 0 + 5 m - 2 = 3 < = > 5 m - 2 = 3 < = > 5 m = 5 < = > m = 1 V ậ y m = 1 f, H à m s ố c ắ t O x t ạ i x = 2 n ê n t h a y x = 2; y = 0 v à o t a c ó : (3 - 9 m) . 2 + 5 m - 2 = 0 < = > 6 - 18 m + 5 m - 2 = 0 < = > - 13 m + 4 = 0 < = > 13 m = 4 < = > m = \frac{4}{13} V ậ y m = \frac{4}{13}$

$g, T h a y y = 3 v à o h à m s ố y = 5 x - 3 t a c ó : 5 x - 3 = 3 < = > 5 x = 6 < = > x = \frac{6}{5} = > B (\frac{6}{5}; 3) T h a y B (\frac{6}{5}; 3) v à o h à m s ố t a c ó : (3 - 9 m) . \frac{6}{5} + 5 m - 2 = 3 < = > \frac{18}{5} - \frac{54}{5} m + 5 m = 5 < = > - \frac{29}{5} m = \frac{7}{5} < = > m = - \frac{7}{29} V ậ y m = - \frac{7}{29} h, T h a y x = - 2 v à o y = 2 x - 1 t a c ó : y = 2 . (- 2) - 1 = - 5 = > C (- 2; - 5) T h a y C (- 2; - 5) v à o h à m s ố t a c ó : (3 - 9 m) . (- 2) + 5 m - 2 = - 5 < = > - 6 + 18 m + 5 m = - 3 < = > 23 m = 3 < = > m = \frac{3}{23} V ậ y m = \frac{3}{23}$ ..

...Xem thêm

Answer 2

$a, H à m s ố đ ồ n g b i ế n < = > 3 - 9 m > 0 < = > 9 m < 3 < = > m < \frac{1}{3} V ậ y m < \frac{1}{3} b, H à m s ố n g h ị c h b i ế n < = > 3 - 9 m < 0 < = > 9 m > 3 < = > m > \frac{1}{3} V ậ y m > \frac{1}{3} c, T h a y O (0; 0) v à o h à m s ố t a c ó : (3 - 9 m) . 0 + 5 m - 2 = 0 < = > 5 m - 2 = 0 < = > 5 m = 2 < = > m = \frac{2}{5} V ậ y m = \frac{2}{5} d, T h a y A (1; 4) v à o h à m s ố t a c ó : (3 - 9 m) . 1 + 5 m - 2 = 4 < = > 3 - 9 m + 5 m = 6 < = > 3 - 4 m = 6 < = > - 4 m = 3 < = > m = - \frac{3}{4} V ậ y m = - \frac{3}{4}$

$e, H à m s ố c ắ t O y t ạ i y = 3 n ê n t h a y x = 0; y = 3 v à o t a c ó : (3 - 9 m) . 0 + 5 m - 2 = 3 < = > 5 m - 2 = 3 < = > 5 m = 5 < = > m = 1 V ậ y m = 1 f, H à m s ố c ắ t O x t ạ i x = 2 n ê n t h a y x = 2; y = 0 v à o t a c ó : (3 - 9 m) . 2 + 5 m - 2 = 0 < = > 6 - 18 m + 5 m - 2 = 0 < = > - 13 m + 4 = 0 < = > 13 m = 4 < = > m = \frac{4}{13} V ậ y m = \frac{4}{13}$

$g, T h a y y = 3 v à o h à m s ố y = 5 x - 3 t a c ó : 5 x - 3 = 3 < = > 5 x = 6 < = > x = \frac{6}{5} = > B (\frac{6}{5}; 3) T h a y B (\frac{6}{5}; 3) v à o h à m s ố t a c ó : (3 - 9 m) . \frac{6}{5} + 5 m - 2 = 3 < = > \frac{18}{5} - \frac{54}{5} m + 5 m = 5 < = > - \frac{29}{5} m = \frac{7}{5} < = > m = - \frac{7}{29} V ậ y m = - \frac{7}{29} h, T h a y x = - 2 v à o y = 2 x - 1 t a c ó : y = 2 . (- 2) - 1 = - 5 = > C (- 2; - 5) T h a y C (- 2; - 5) v à o h à m s ố t a c ó : (3 - 9 m) . (- 2) + 5 m - 2 = - 5 < = > - 6 + 18 m + 5 m = - 3 < = > 23 m = 3 < = > m = \frac{3}{23} V ậ y m = \frac{3}{23}$ ..

1 câu trả lời 344

Câu hỏi hot cùng chủ đề

Bài viết mới nhất Lớp 9