Obliczenia
[tex]4,2:(\frac{4}{5}-0,2)=4,2:(\frac{8}{10}-0,2)=\\\\=4,2:(0,8-0,2)=4,2:0,6=\boxed7[/tex]
4.2(0.8-0.2)=4.2:0.6=7
4=o.8
5
