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b)= 3/16* (-8/3)-3*(2/12+9/12)= -1/2-3*11/12= -1/2-11/4= -2/4-11/4= -13/4
c)= (20/9-10/3): (-20/3)= (20/9-30/9)*(-3/20)= -10/9* (-3/20)= 1/6