Odpowiedź:
Zadanie 11.
[tex]a) \: - 2.7 + 1.3 = 1.4[/tex]
[tex]b) \: - 1 \frac{2}{3} + ( - 2 \frac{1}{5} ) = - 1 \frac{10}{15} + ( - 2 \frac{3}{15} ) = - 3 \frac{13}{15} [/tex]
[tex]c) \: - 2.3 - 1.6 = - 3.9[/tex]
[tex]d) \: - 3 \frac{6}{7} - ( - 1 \frac{2}{3} ) = - 3 \frac{18}{21} + 1 \frac{14}{21} = - 2 \frac{4}{14} [/tex]
Zadanie 12.
[tex]a) \: 1 \frac{2}{7} \times ( - 2 \frac{1}{3} ) = \frac{9}{7} \times ( - \frac{7}{3} ) = - \frac{63}{21} = \frac{9}{3} = 3[/tex]
[tex]b) \: ( - 12 \frac{2}{3} ) \div ( - 3 \frac{1}{6} ) = ( - \frac{38}{3} ) \div ( - \frac{19}{6} ) = ( - \frac{38}{3} ) \times ( - \frac{6}{19} ) = \frac{228}{57} = 4[/tex]
Zadanie 13.
[tex] - 3 + ( - 2) \times ( - 7) = 11[/tex]
Zadanie 14.
[tex]a) \: - 95[/tex]
[tex]b) \: - 19[/tex]
[tex]c) \: - 1[/tex]
[tex]d) \: - 26[/tex]
Pozdrawiam.
