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Să se calculeze a) 3/4+1/3-(1-1/2) b) 5/6+1/2-(1/2-1/3) c) 15/16-1/2-(7/8-3/4)d)4-1/8-[2-(3/2-3:4)]e)13/20+1/2-(1/4+1/5)​