A) A = 7/4 - 3/4 * (- 1/9)
A = 7/4 + 3/36
A = [tex] \frac{7 X 9}{4 X 9} [/tex] + 3/36
A = 63/36 + 3/36
A = 66/36
A = [tex] \frac{66 / 6}{36 / 6} [/tex]
A = 11/6
B = [tex] \frac{5 X 10^{5} X (2 X 10^{- 1})^{3} }{24 X 10^{2} } [/tex]
B = [tex] \frac{5 X 100 000 X 0,008 }{24 X 100} [/tex]
B = [tex] \frac{500 000 X 0,008}{2 400} [/tex]
B = 4 000 / 2 400
B = 5/3
B) 1. C = (3x - 5)² - (2x - 1) (3x - 5)
C = (3x)² - 2 * 3x * 5 + 5² - [2x * 3x + 2x * (- 5) - 1 * 3x - 1 * (- 5)]
C = 9x² - 30x + 25 - (6x² - 10x - 3x + 5)
C = 9x² - 30x + 25 - 6x² + 10x + 3x - 5
C = 3x² - 17x + 20
2. C = (3x - 5)² - (2x - 1) (3x - 5)
C = (3x - 5) [(3x - 5) - (2x - 1)]
C = (3x - 5) (3x - 5 - 2x + 1)
C = (3x - 5) (x - 4)