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3/4-3/4:4/3-4/3:2=3/4-3/4*3/4-2/3=3/4-9/16-2/3=
36/48-27/48-32/48=-23/48
b)
7/2 : (1/2+1/3-1/4)= 7/2 : (6/12+4/12-3/12)=7/2:7/12=7/2*12/7=12/2=6
c)
(3,25-2*0,25) : (7/3-2/3+7/2*9/4)=(3,25-0,5) : (5/3+63/8)=
2,75 : (40/24+189/24)=11/4 : 229/24=11/4 *24/229=66/229