Odpowiedź:
Zadanie 9
a)
[tex]3 \frac{2}{3} + ( - 3.2) = 3 \frac{2}{3} - 3 \frac{1}{5} = 3 \frac{10}{15} - 3 \frac{3}{15} = \frac{7}{15} [/tex]
b)
[tex] - \frac{1}{5} - ( - 2.3) = - 0.2 + 2.3 = 2.1[/tex]
c)
[tex] - 0.24 \div ( - \frac{4}{5} ) = - 0.24 \div ( - 0.8) = 0.3[/tex]
d)
[tex] - 2 \frac{2}{3} \times 0.25 = - \frac{8}{3} \times \frac{1}{4} = - \frac{2}{3} [/tex]
zadanie 10
[tex]27 \div ( - 3) - {4}^{2} = - 9 - 16 = - 25[/tex]
[tex] \frac{ - 14 + 3 \times ( - 12)}{5} - ( - 3) = \frac{ - 14 - 36}{5} + 3 = \frac{ - 50}{5} + 3 = - 10 + 3 = - 7[/tex]
