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b) -2 2/8-1 5/12=-18/8-17/12=-54/24-34/24=-88/24=-3 16/24=-3 2/3
c) 1,8*(-2/3)=18/10*(-2/3)=-6/5=-1 1/5
d) (-0,72):(-1 2/7)=(-72/100):(-9/7)=(-72/100)*(-7/9)=14/25
e) (-13+8)*(-2)=(-5)*(-2)=10