Cześć ;-)
1)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\a+b=\frac{3}{4}+\frac{4}{3}=\frac{9}{12}+\frac{16}{12}=\frac{25}{12}=2\frac{1}{12}[/tex]
2)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\b-a=\frac{4}{3}-\frac{3}{4}=\frac{16}{12}-\frac{9}{12}=\frac{7}{12}[/tex]
3)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\\frac{a}{2}=\frac{3}{4}:2=\frac{3}{4}\cdot\frac{1}{2}=\frac{3}{8}[/tex]
4)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\\frac{2}{b}=2:\frac{4}{3}=2\cdot\frac{3}{4}=\frac{3}{2}=1\frac{1}{2}[/tex]
5)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\a\cdot b=\frac{3}{4}\cdot\frac{4}{3}=\frac{12}{12}=1[/tex]
6)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\a:b=\frac{3}{4}:\frac{4}{3}=\frac{3}{4}\cdot\frac{3}{4}=\frac{9}{16}[/tex]
7)
[tex]a=\frac{3}{4}, \ b=\frac{4}{3}\\\\b:a=\frac{4}{3}:\frac{3}{4}=\frac{4}{3}\cdot\frac{4}{3}=\frac{16}{9}=1\frac{7}{9}[/tex]
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