9.
a)
[tex]5.25 - ( - 1 \frac{1}{3} ) = 5 \frac{1}{4} + 1 \frac{1}{3} = 5 \frac{3}{12} + 1 \frac{4}{12} = 6 \frac{7}{12} [/tex]
b)
[tex] - 3 \frac{3}{5} - 4.2 = - 3.6 - 4.2 = - 7.8[/tex]
c)
[tex] - 5 \frac{2}{7} + 3.2 = - 5 \frac{2}{7} + 3 \frac{1}{5} = - 5 \frac{10}{35} + 3 \frac{7}{35} = - 2 \frac{3}{35} [/tex]
d)
[tex] - 6.4 - ( - 2 \frac{1}{4} ) = - 6.4 + 2.25 = - 4.15[/tex]
10.
a)
[tex]12 - ( - 15) - 12 + 6 = 12 + 15 - 6 = 27 - 6 = 21[/tex]
b)
[tex] \frac{4}{5} + \frac{2}{3} - 0.8 - \frac{2}{3} + \frac{5}{6} = \frac{24}{30} + \frac{20}{30} - \frac{24}{30} - \frac{20}{30} + \frac{25}{30} = \frac{25}{30} = \frac{5}{6} [/tex]
c)
[tex] - \frac{1}{2} + 0.75 - \frac{1}{4} + 1.5 = - 0.5 + 0.75 - 0.25 + 1.5 = 1.5[/tex]
11.
[tex]A = - 1 \frac{2}{5} [/tex]
Odp.B
12.
Odp.C
[tex]14 - 4 = 10 \\ \\ \\ - 6 + 10 = 4[/tex]
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