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b. 3/4 + 3√2 - 5 = (3 + 12√2 - 20)/4 = (12√2 - 17)/4 = 3√2 - 17/4 <= Rpta.
c. 4√5 - 0,75 - 8√5 + 0,375 = -4√5 - 0.375 = -4√5 - 3/8 <= Rpta.
d. (6 - 8√3) - (3√3 - 4) = 6 + 4 - 8√3 - 3√3 = 10 - 11√3 <= Rpta.
e. 4 - 3/5 + (0,3 * 0,25) - 5/2 = (40 - 6 + 10(3/10 * 1/4) - 25)/10 = (9 + 30/4)/10 = 9/10 + 3/4 <= Rpta.