a) [(2/3)^-1 - 3/4]^-1
b) [(3/4)^-1 - (3/2)^-2]-1
^ - do potęgi
a)=3/2 - 4/3= 9/6 - 8/6= 1/6
b)= (4/3 - 4/9)-1= (12/9-4/9)-1=-8/9
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a)=3/2 - 4/3= 9/6 - 8/6= 1/6
b)= (4/3 - 4/9)-1= (12/9-4/9)-1=-8/9