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3.a³-9²a
5.6+7n
6.9×⁸+18×⁵-9ײ
7.6m³
8.12k²+65k⁶+36k⁴-223k²-126
9.a2-3
10 2n⁵-14n⁴+³n+3
Step-by-step explanation:
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