6.9a−(−3.6a+8.2a^2) = 6,9a + 3,6a - 8,2a² = 10,5a - 8,2a²
(y^2−1.85y−3.2)−(0.3y^2+5)−(3y−8.2) = y² - 1,85y - 3,2 - 0,3y² - 5 -3y + 8,2 = 0,7y² -4,85y + 5
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6.9a−(−3.6a+8.2a^2) = 6,9a + 3,6a - 8,2a² = 10,5a - 8,2a²
(y^2−1.85y−3.2)−(0.3y^2+5)−(3y−8.2) = y² - 1,85y - 3,2 - 0,3y² - 5 -3y + 8,2 = 0,7y² -4,85y + 5