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a) 5n
b) (a + a³) : 2
c) 3/4 y
2.
2,4xy² * (-2,5) * x²y³ = -6x³y⁵
3.
3a² - 6a = 3 * (-1/3)² - 6 * (-1/3) = 3 * 1/9 + 2 = 1/3 + 2 = 2 1/3