Если a ∴ b = -(a·b)/2 или 5 ∴ 4 = -(5·4)/2 = -10, найдите значение f из уравнения 12 ∴ f = 24.

-(12 · f)/2 = 24 ⇒ -6f = 24 ⇒ f = -4.

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