б) (-3/8 + 2 1/16)*16 = (-6/16 +33/16)*16=-6+33=27

в) 8.4*(3/7 - 5/12) =84/10 * (36/84-35/84)=84/10 * 1/84 =1/10=0,1

а) -3,83*2,36 + 7,64*(-3,83) = -3,83*(2,36+7,64)=-3,83*10=-38,3