1.
[tex] \frac{2}{3} \div 3 = \frac{2}{3} \times \frac{1}{3} = \frac{2}{9} [/tex]
[tex]2.4 \div 0.4 = 2 \frac{4}{10} \div \frac{4}{10} = \frac{24}{10} \times \frac{10}{4} = \frac{24}{4} = 6[/tex]
[tex] \frac{8}{5} \div 47 = \frac{8}{5} \times \frac{1}{47} = \frac{8}{235} [/tex]
[tex]720 \div 0.8 = 720 \div \frac{8}{10} = 720 \times \frac{10}{8} = 90 \times 10 = 900[/tex]
[tex]2.4 \div 115 = 2 \frac{4}{10} \div 115 = \frac{24}{10} \times \frac{1}{115} = \frac{24}{1150} = \frac{12}{575} [/tex]
[tex]247 \div 421 = 247 \times \frac{1}{421} = \frac{247}{421} [/tex]
[tex]910000 \div ( - 7000) = \frac{910000}{ - 7000} = - \frac{910}{7} = - 130[/tex]
[tex] - \frac{5}{8} \div ( - 123) = - \frac{5}{8} \times ( - \frac{1}{123} ) = \frac{5}{984} [/tex]
2.
pani Ala - kupiła 2,4 kg
pani Krysia - kupiła 4 razy mniej niż pani Ala
[tex]2.4 \div 4 = 2 \frac{4}{10} \div 4 = \frac{24}{10} \times \frac{1}{4} = \frac{6}{10} = 0.6kg[/tex]
Odp. Pani Krysia kupiła 0,6 kg jabłek.
ps. W załączniku są przykłady, o które pytałaś.
