4
[tex]( - 2.5 - ( - \frac{1}{4} ) \div ( - 1.5) = \\ \\ ( - 2 \frac{1}{2} + \frac{1}{4} ) \div ( - 1 \frac{1}{2} ) = \\ \\ ( - \frac{5}{2} + \frac{1}{4} ) \div ( - \frac{3}{2} ) = \\ \\ ( - \frac{10 + 1}{4} ) \times ( - \frac{ 2}{3} ) = \\ \\ ( - \frac{9}{4} ) \times ( - \frac{2}{3} ) = \frac{3}{2} = 1.5[/tex]
5
[tex]( - 0.81) \div \frac{9}{10} + 5 \times 0.48 = \\ \\ ( - \frac{81}{100} ) \times \frac{10}{9} + \frac{5}{1} \times \frac{48}{100} = \\ \\ - \frac{9}{10} + \frac{48}{20} = \frac{ - 18 + 48}{20} = \\ \\ \frac{30}{20} = \frac{3}{2} = 1 \frac{1}{2} = 1.5[/tex]
W 6 nie ma pełnego przykładu bo na końcu brakuje
