Question

Giúp mình 2 câu này ạ

Answer 1

b/ (2x - 1)² - 2x (1 +2x)

= 4x² - 4x + 1 - 2x - 4x²

= -6x + 1

Answer 2

a, \(\dfrac{6}{x^2-9}\) + \(\dfrac{5}{x-3}\) - \(\dfrac{2}{x+3}\)

= \(\dfrac{6}{\left(x-3\right)\left(x+3\right)}\) + \(\dfrac{5\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}\) - \(\dfrac{2\left(x-3\right)}{\left(x+3\right)\left(x-3\right)}\)

= \(\dfrac{6+5x+15-2x+6}{\left(x-3\right)\left(x+3\right)}\) = \(\dfrac{27+3x}{\left(x+3\right)\left(x-3\right)}\)