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b)12/7*(11/4-5/3*1/4)=12/7*(11/4-5/12)=12/7*
7/3=4
c)10/3*(9/4-3/2*1/5)=10/3*(9/4-3/10)=10/3*
39/20=13/2=6 1/2
d)13/4+1/2
———-
10/3*(11/6-13/12)=
15/4
——-
10/3*3/4=
15/4
——-
5*1/2=
15/4
——-
5/2=3/2=1 1/2