Ответ:
1) 5a²+8a-3a²-8a+1
5a²-3a²+1=2a²+1
2) 8x³-3
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Ответ:
1) 5a²+8a-3a²-8a+1
5a²-3a²+1=2a²+1
2) 8x³-3