Ответ:
Объяснение:
(-5t-9b)² = (-5t)²-2*(-5t)*9b+(9b)² =
= +25t²+90tb+81b²
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Ответ:
Объяснение:
(-5t-9b)² = (-5t)²-2*(-5t)*9b+(9b)² =
= +25t²+90tb+81b²