б) 7.5-6.3-4.2= -3
в) -0.82+3.35-6.42= -3.89
г) 6.5-1.8-3.2=1.5
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б) 7.5-6.3-4.2= -3
в) -0.82+3.35-6.42= -3.89
г) 6.5-1.8-3.2=1.5