(x – 2).(x + 4) = 0 (x -2).( x + 15) = 0 (7-x).( x + 19) = 0 -5 < x < 1 |x| < 3 (x - 3)(x - 5) < 0 (x - 5)(x - 7) < 0 -6x - ( -7)
(x – 2).(x + 4) = 0 (x -2).( x + 15) = 0 (7-x).( x + 19) = 0 -5 < x < 1 |x| < 3 (x - 3)(x - 5) < 0 (x - 5)(x - 7) < 0 -6x - ( -7) = 25 46 - ( x - 11 ) ... Đọc tiếp