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Verified answer
5,6 × 10^6 - 5 × 10^5 + 20 × 10^4= 5,6 × 10^6 - 0,5 × 10^6 + 0,2 × 10^6
= (5,6 - 0,5 + 0,2) × 10^6
= 5,3 × 10^6