a*(a-2b)-(3b+a)²
a²-2ab-(9b²+6ab+a²)
a²-2ab-9b²-6ab-a²
Ответ = -8ab-9b²
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a*(a-2b)-(3b+a)²
a²-2ab-(9b²+6ab+a²)
a²-2ab-9b²-6ab-a²
Ответ = -8ab-9b²