Question

 giúp tôi với đi mọi người 

Answer 1

Bài 1:

a)  2x(x² - 4x + 1)

= 2x³ - 8x² + 2x

b)  (16x⁵y⁴ - 8x⁴y³) : 4x²y² + 2x²y

= 4x³y² - 2x²y + 2x²y

= 4x³y²

c)  \(\dfrac{x+2}{x}\) + \(\dfrac{5-x}{x+2}\)

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

= \(\dfrac{x^2+4x+4+5x-x^2}{x\left(x+2\right)}\)

= \(\dfrac{4+9x}{x\left(x+2\right)}\)

Bài 2:

(3x + 2)(3x - 2) - 9x(x - 1) = 4

9x² - 4 - 9x² + 9x = 4

9x = 8

 x = \(\dfrac{8}{9}\)