15 × (½)² - 9 × (⅔)² =
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15 × (½)² - 9 × (⅔)² = 15* ¼ - 9* 4/9=3,75-4=-0,25
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15 × (½)² - 9 × (⅔)² = 15* ¼ - 9* 4/9=3,75-4=-0,25