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b) -54 - (-9) = -54 +9 = -45
c) 51 + (-91) :(-7) = 51 + 7 = 58
d) 2,5 * 8 - (-5/1) * (-2/15) = 20 - ( 2/3 ) = 19 i 1/3
b) (-6)*9-(-36):4=-54+9=-45
c) (17)*3+7*(-13):(-7)= 51+(-91):(-7)= 51+7=58
d) 2 1/2*8-(-5)*(-2/15)= 20-(-5)*(2/15)= 20-(-10/75=20+10/75=20 10/75= 20 2/15