Hej!
6]
[tex]2\frac{3}{20}+1,27-(\frac{4}{10}\cdot1,4)=2\frac{15}{100}+1,27-(0,4\cdot1,4)=\\\\=2,15+1,27-0,56=3,42-0,56=2,86 \ \boxed P[/tex]
7]
[tex]0,7:7\frac{1}{2}=\frac{7}{10}:\frac{15}{2}=\frac{7}{10}\cdot\frac{2}{15}=\frac{7}{75} \ \boxed R[/tex]
8]
[tex](1\frac{2}{5}+0,5):4=(1\frac{4}{10}+0,5):4=(1,4+0,5):4\\\\=1,9:4=19:40=\frac{19}{40} \ \boxed N[/tex]
9]
[tex]7,2-1\frac{1}{9}=7\frac{2}{10}-1\frac{1}{9}=7\frac{1}{5}-1\frac{1}{9}=\\\\=7\frac{9}{45}-1\frac{5}{45}=6\frac{4}{45} \ \boxed O[/tex]
10]
[tex](\frac{2}{5})^2-0,08=\frac{2^2}{5^2}-0,08=\frac{2\cdot2}{5\cdot5}-0,08=\\\\=\frac{4}{25}-0,08=\frac{16}{100}-0,08=0,16-0,08=0,08 \ \boxed B[/tex]
