2 câu trả lời
a)4x(x -5) - ( x -1) (4x -3) = 5
x= 4x^2 - 20x - 4x^2 + 7x -3 = 5
x=-13x
x = 8-8/13
4x(x - 5) - (x - 1)(4x - 3)= 5
<=> 4x ² - 20x - (4x ² - 3x - 4x + 3) = 5
<=> 4x ² - 20x - 4x ² +3x + 4x - 3 = 5
<=> -20x + 7x = 5+3
<=> - 13x = 8
<=> x = 8/-13