Explicație pas cu pas:
(3/1-1/3)×(9/8)^2=(9/3-1/3)×(9/8)^2=8/3×81/64=628/192
3/4:(3/4-1/2)×4/9=3/4:(3/4-2/4)×4/9=3/4×4/2×4/9=48/324.
[tex]\it a)\ \ = \dfrac{\not8}{\not3}\cdot\dfrac{\not81\ ^{27}}{\not64\ _8}=\dfrac{27}{8}=3\dfrac{3}{8}\\ \\ \\ b)\ \ = \dfrac{3}{4}:\dfrac{1}{4}-\dfrac{4}{9}=\dfrac{3}{\not4}\cdot\dfrac{\not4}{1}-\dfrac{4}{9}=\dfrac{^{3)}3}{\ \ 1}-\dfrac{4}{9}=\dfrac{5}{9}[/tex]
