6а² – 3а + 11 – (–3а – а² + 7)
6a²-3a+11+3a+a²-7
Ответ: 7a²+4
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6а² – 3а + 11 – (–3а – а² + 7)
6a²-3a+11+3a+a²-7
Ответ: 7a²+4