Zadanie 1
[tex] - 4 + \frac{5}{7} = - \frac{4}{1} + \frac{5}{7} = \\ = \frac{ - 28 + 5}{7} = \frac{ - 23}{7} = - 3 \frac{2}{7} \\ \\ \\ 6 - 8.8 = - (8.8 - 6) = - 2.8 \\ \\ \\ - 3 + (2.5) = - 5.5 \\ \\ \\ - 2 - ( - 1 \frac{1}{4} ) = - 2 + 1.25 = - 0.75[/tex]
Zadanie 2
[tex]24 \div ( - 6) \times ( - 2) = - 4 \times ( - 2) = 8 \\ \\ \\ - 3 \times 0 - 42 \div ( - 7) = 0 + 6 = 6 \\ \\ \\ \\ \frac{( - 14) + 6 \times ( - 16)}{ - 5} = \frac{( - 14) + ( - 96)}{ - 5} = \\ \\ = \frac{ - 110}{ - 5} = 22[/tex]
Zadanie 3
[tex]21 \div ( - 7) - {2}^{3} = - 3 - 8 = - 11 \\ \\ \\ \frac{ - 16 + 4 \times ( - 11)}{5} - ( - 4) = \frac{ - 16 + ( - 44)}{5} + 4 = \\ \\ = \frac{ - 60}{5} + 4 = - 12 + 4 = - 8[/tex]
Zadanie 4
a - 8
b - 10
