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Вказати, які з наступних множин є порожніми: A = { x | x - літера, що передує...

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Вказати, які з наступних множин є порожніми:

A = {x | x - літера, що передує a в алфавіті}

B = {x | x2 = 9 i 2x = 4}

C = { x, y ∈ R : x2 + y2 = -1}

D = {x | x = x + 8}

F = {(x, y) | x - 3y = 1}

G = {x | x∈R : x2 + x + 1 = 0}

 

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