Verified answer

Объяснение:

2)

[tex] \frac{ {x}^{3} {y}^{15} }{x {y}^{6} } = \frac{ {x}^{2} {y}^{9} }{1} = {x}^{2} {y}^{9} [/tex]

3)

- (2x - 6y) = - 2x + 6y

- (2m + 3m) = - 2m - 3m = - 5m

4)

5(6x - 7m - 11) = 30x - 35m - 55

5)

(x - 4)(5 - 2x) = 5x - 2x² - 20 + 8x = - 2x² + 13x - 20

6(2x + 3) = 4(x - 7)

12x + 18 = 4x - 28

12x - 4x = - 28 - 18

8x = - 46 /:8

x = - 5,75