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d. 3n²-m = 3(3,8)² - 1,6 = 11,4² - 1,6 = 129,96 - 1,6 = 128,36
e. 2m² - 3n + 1 = 2(1,6)² - 3(3,8) + 1 = 3,2² - 11,4 + 1 = 6,4 - 11,4 + 1 = -4
f. (2m² - 4n) : (2m - 1) = (2(1,6)² - 4(3,8)) : (2(1,6) - 1) = (3,2² - 15,2) : (3,2 - 1) = (11,4 - 15,2) : (3,2 - 1) = -3,8 : 2,2 = -1,72