a) = (37/7 -1/3) : (1/5+9/7) = (111/21 - 7/21): (7/35+ 45/35)= 104/21 : 52/35= 104/21*35/52= 3 1/3
b) = ( 8 1/4 - 9/4* 10/9) :13/12=(32/4- 90/36):13/12= (288/36 - 90/36) :13/12= 198/36 * 12/13= 5 1/3
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a) = (37/7 -1/3) : (1/5+9/7) = (111/21 - 7/21): (7/35+ 45/35)= 104/21 : 52/35= 104/21*35/52= 3 1/3
b) = ( 8 1/4 - 9/4* 10/9) :13/12=(32/4- 90/36):13/12= (288/36 - 90/36) :13/12= 198/36 * 12/13= 5 1/3