Respostas

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2014-05-12T11:58:23-03:00
199² = (200 – 1)² = 200² – 2 × 200 × 1 + 1² = 40000 – 400 + 1 = 39601

88² = (90 – 2)² = 90² – 2 × 90 × 2 + 2² = 8100 – 360 + 4 = 7744

49² = (50 – 1)² = 50² – 2 × 50 × 1 + 1² = 2500 – 100 + 1 = 2401
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