ex 4
[tex] \frac{15}{1} - \frac{3}{5} = \frac{75 - 3}{5} = \frac{72}{5} [/tex]
ex 5
[tex]1 - ( \frac{7}{9})^{17} \div ( \frac{7}{9} \times { (\frac{7}{9} })^{4})^{3} = 1 - ( \frac{7}{9})^{17} \div ( { (\frac{7}{9} )}^{5} )^{3} = 1 - ( \frac{7}{9})^{17} \div (\frac{7}{9})^{15} = 1 - ( \frac{7}{9} )^{2} = 1 - \frac{49}{81} = \frac{81}{81} - \frac{49}{81} = \frac{32}{81} [/tex]
ex 6
[tex]( \frac{3}{4})^{2} \times 1 \times \frac{5}{9} - \frac{5}{8} \div 1 \times \frac{7}{18} = \frac{9}{16} \times \frac{14}{9} - \frac{5}{9} \div \frac{25}{18} = \frac{7}{8} - \frac{5}{9} \times \frac{18}{25} = \frac{7}{8} - \frac{2}{5} = \frac{35 - 16}{45} = \frac{19}{45} [/tex]
19/45 = 0,42
7/16 = 0,43
19/45 < 7/16
testul 3
ex 1
5/9 din 21/25= 5/9 * 21/25 = 7/15
18% din 150 = 18/100 *150 = 27
