1.
[tex] \frac{9}{2} + 3 \times \frac{3}{2} [/tex]
[tex] \frac{9}{2} + \frac{9}{2} = 9[/tex]
3.
[tex] \frac{8}{5} + \frac{23}{5} \div \frac{23}{10} - \frac{12}{5} [/tex]
[tex] \frac{8}{5} + \frac{23}{5} \times \frac{10}{23} - \frac{12}{5} [/tex]
[tex] \frac{8}{5} + 2 - \frac{12}{5} = \frac{6}{5} [/tex]
4.
[tex]( \frac{2}{3} \times \frac{1}{8} + \frac{9}{2} ) \times \frac{12}{11} [/tex]
[tex]( \frac{1}{3} \times \frac{1}{4} + \frac{9}{2} ) \times \frac{12}{11} [/tex]
[tex]( \frac{1}{12} + \frac{9}{2} ) \times \frac{12}{11} [/tex]
[tex] \frac{55}{12} \times \frac{12}{11 } = 5[/tex]
trzeciego nie umiem :(
