Răspuns: [tex]\bf \red{\underline{~1~}}[/tex]
Explicație pas cu pas:
[tex]\bf \dfrac{28}{45}\cdot \dfrac{108}{80}:\dfrac{42}{50}~=~ \dfrac{28}{45}~\cdot ~\dfrac{108^{(4}}{80}~\cdot~\dfrac{50}{42}=[/tex]
[tex]\bf \dfrac{28}{45}~\cdot ~\dfrac{27}{20}~\cdot~\dfrac{50^{(2}}{42}~=~ \dfrac{\not28}{45}~\cdot ~\dfrac{27}{\not20}~\cdot~\dfrac{25}{21}=[/tex]
[tex]\bf \dfrac{7}{\not45}~\cdot ~\dfrac{\not27}{5}~\cdot~\dfrac{25}{21}=\dfrac{7}{5}~\cdot ~\dfrac{3}{5}~\cdot~\dfrac{25}{21}=[/tex]
[tex]\bf \dfrac{\not21}{\not25}~\cdot~\dfrac{\not25}{\not21}=\dfrac{1}{1}~\cdot ~\dfrac{1}{1}=\dfrac{1}{1}=\red{\underline{~1~}}[/tex]
==pav38==
Baftă multă !
