Ответ:
-16+16а-16а²-(18а-3а²-12+2а)+а² = 16+16а-16а²-18а+3а²+12+2а+а² = -12а² + 28
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Ответ:
-16+16а-16а²-(18а-3а²-12+2а)+а² = 16+16а-16а²-18а+3а²+12+2а+а² = -12а² + 28