1a) (12ab - 5a) - (ab + 6a) = 12ab - 5a - ab - 6a = 11ab - 11a
1б) 5x(3x² - 2x - 4) = 5x * 3x² - 5x * 2x - 5x * 4 = 15x³ - 10x² - 20x
2a) 3x² + 9xy = 3x * x + 3 * 3xy = 3x(x + 3y)
2б) 10x⁵ - 5x = 5 * 2 * x * x⁴ - 5x = 5x(2x⁴ - 1)
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1a) (12ab - 5a) - (ab + 6a) = 12ab - 5a - ab - 6a = 11ab - 11a
1б) 5x(3x² - 2x - 4) = 5x * 3x² - 5x * 2x - 5x * 4 = 15x³ - 10x² - 20x
2a) 3x² + 9xy = 3x * x + 3 * 3xy = 3x(x + 3y)
2б) 10x⁵ - 5x = 5 * 2 * x * x⁴ - 5x = 5x(2x⁴ - 1)
2b)2,5x(4x(в четвёртой степени)-2)