70,5² - 70,4² = (70,5 - 70,4)(70,5 + 70,4) = 0,1 * 140,9 = 14,09
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70,5² - 70,4² = (70,5 - 70,4)(70,5 + 70,4) = 0,1 * 140,9 = 14,09