Cześć!
7)
[tex]1\frac{3}{5}+2\frac{1}{4}-1\frac{1}{10}=1\frac{3\cdot2}{5\cdot2}+2\frac{1\cdot25}{4\cdot25}-1,1=1\frac{6}{10}+2\frac{25}{100}-1,1=\\\\=1,6+2,25-1,1=3,85-1,1=2,75[/tex]
8)
[tex]3\frac{1}{3}:1\frac{1}{4}=\frac{3\cdot3+1}{3}:\frac{1\cdot4+1}{4}=\frac{9+1}{3}:\frac{4+1}{4}=\frac{10}{3}:\frac{5}{4}=\frac{\not10^2}{3}\cdot\frac{4}{\not5_1}=\frac{8}{3}=2\frac{2}{3}\\[/tex]
9)
[tex]3\frac{1}{5}\cdot\frac{3}{4}+4\frac{2}{3}=\frac{3\cdot5+1}{5}\cdot\frac{3}{4}+4\frac{2}{3}=\frac{15+1}{5}\cdot\frac{3}{4}+4\frac{2}{3}=\frac{\not16^4}{5}\cdot\frac{3}{\not4_1}+4\frac{2}{3}=\\\\=\frac{12}{5}+4\frac{2}{3}=2\frac{2}{5}+4\frac{2}{3}=2\frac{2\cdot3}{5\cdot3}+4\frac{2\cdot5}{3\cdot5}=2\frac{6}{15}+4\frac{10}{15}=6\frac{16}{15}=7\frac{1}{15}[/tex]
