Zad. 9
[tex]6\frac{1}{4} - 1\frac{3}{4} = \frac{25}{4}-\frac{7}{4} = \frac{18}{4} = 4 \frac{2}{4} = 4\frac{1}{2} \\[/tex]
[tex]7 \frac{3}{12} - 5 \frac{9}{12} = \frac{87}{12} - \frac{69}{12} = \frac{18}{12} = 1 \frac{6}{12} =1 \frac{1}{2}[/tex]
[tex]9\frac{3}{10} - 7 \frac{8}{10} = \frac{93}{10} - \frac{78}{10} = \frac{15x}{10} = 1 \frac{5}{10} = 1 \frac{1}{2}[/tex]
suma = [tex]4\frac{1}{2} + 1\frac{1}{2} + 1\frac{1}{2} = \frac{9}{2} + \frac{3}{2} + \frac{3}{2} = \frac{15}{2} = 7\frac{1}{2}[/tex]
Zad. 10
[tex]1\frac{4}{5} + 2 \frac{3}{5} = \frac{9}{5} + \frac{13}{5} = \frac{22}{5} = 4\frac{2}{5}[/tex]
[tex]5\frac{1}{5} - 4 \frac{2}{5} = \frac{26}{5} - \frac{22}{5} = \frac{4}{5}[/tex]
60min : 5 = 12
12* 4 = 48minut
Odp. Spacer zajął Tomkowi [tex]\frac{4}{5}[/tex] godziny (48minut)
