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b) 1 - 2 * 1
3 3
-------------= - 1 / 5 = -1 * 1= - 1
5 3 3 5 15
c) -64 + 16 - 4 = -52
d) 0,25(-0,5 - 0,5) + 0,2 = 0,25 -1 +0,2 = -0,55