а) (12ab - 5a) - (ab + 6a) = 12ab - 5a - ab - 6a = 11ab - 11a
b) 5x(3x² - 2x - 4) = 15x³ - 10x² - 20x
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а) (12ab - 5a) - (ab + 6a) = 12ab - 5a - ab - 6a = 11ab - 11a
b) 5x(3x² - 2x - 4) = 15x³ - 10x² - 20x