Cześć ;-)
Obliczenia
[tex]1,25+(-3)\cdot(1,8:\frac{1}{5}-\frac{2}{3})=\\\\=1,25+(-3)\cdot(1,8\cdot5-\frac{2}{3})=\\\\=1,25+(-3)\cdot(9-\frac{2}{3})=1,25+(-3)\cdot8\frac{1}{3}=\\\\=1,25+(-3)\cdot\frac{25}{3}=1,25-25=-(25-1,25)=\boxed{-23,75}[/tex]
Pozdrawiam!