Odpowiedź:
[tex]6.5 \div (2 \frac{1}{4} \times 6 - 0.5) = 6.5 \div ( \frac{9}{4} \times 6 - 0.5) = 6.5 \div ( \frac{27}{2} - 0.5) = 6.5 \div (13.5 - 0.5) = 6.5 \div 13 = 0.5 = \frac{1}{2} [/tex]
[tex](5 - 1 \frac{1}{2} ) \div (2 \frac{3}{8} - 1.75) = 3.5 \div (2.375 - 1.75) = 3.5 \div 0.625 = 5.6[/tex]
[tex]3 \frac{3}{4} \times 0.8 + 2 \frac{2}{3} \times 0.3 = \frac{15}{4} \times \frac{4}{5} + \frac{8}{3} \times \frac{3}{10} = 3 + \frac{4}{5} = 3.8[/tex]
[tex] \frac{5}{7} \times 4.2 - (1 \frac{1}{4} - 0.5) = \frac{5}{7} \times \frac{42}{10} - (1.25 - 0.5) = 3 - 0.75 = 2.25 = 2 \frac{1}{4} [/tex]
[tex]4 \frac{1}{2} - 2.4 \div 2 \frac{2}{3} + 1.4 = 4.5 - \frac{24}{10} \times \frac{3}{8} + 1.4 = 5.9 - \frac{9}{10} = 5.9 - 0.9 = 5[/tex]
