zadanie 3
a)
[tex] - \frac{3}{4} \times 0.8x = - \frac{3}{4} \times \frac{8}{10} x = - \frac{6}{10} x = - 0.6x[/tex]
b)
[tex]1.2x \div 4 = 0.3x[/tex]
c)
[tex]2.1x \div 8 = \frac{21}{10} x \times \frac{1}{8} = \frac{21}{80} x[/tex]
d)
[tex] \frac{y}{8} \times \frac{8}{13} = \frac{y}{13} [/tex]
