Răspuns: [tex]\boxed{\boxed{\bf \dfrac{53}{18}}}[/tex]
Explicație pas cu pas:
Salutare!
[tex]\bf 7:\bigg(2,5-\dfrac{2}{5}\bigg)+\dfrac{11}{30}\cdot \dfrac{5}{3}-1[/tex]
[tex]\bf 7:\bigg(\dfrac{25}{10} -\dfrac{2}{5}\bigg)+\dfrac{11}{6}\cdot \dfrac{1}{3}-1=[/tex]
[tex]\bf 7:\bigg(\dfrac{25}{10} -\dfrac{2\cdot 2}{10}\bigg)+\dfrac{11}{18}-1=[/tex]
[tex]\bf 7:\dfrac{25-4}{10} +\dfrac{11}{18}-1=[/tex]
[tex]\bf 7:\dfrac{21}{10} +\dfrac{11}{18}-1=[/tex]
[tex]\bf 7\cdot\dfrac{10}{21} +\dfrac{11}{18}-1=[/tex]
[tex]\bf \not7\cdot\dfrac{10}{\not21} +\dfrac{11}{18}-1=[/tex]
[tex]\bf \dfrac{10}{3} +\dfrac{11}{18}-1=[/tex]
[tex]\bf \dfrac{10\cdot 6}{18} +\dfrac{11}{18}-\dfrac{18}{18} =[/tex]
[tex]\bf \dfrac{60+11-18}{18} =[/tex]
[tex]\boxed{\boxed{\bf \dfrac{53}{18}}}[/tex]
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