Question

va rog dau coroana repede​

Answer 1

3/100 - [(1/10 - 1/15) - (7/25 - 4/15)] =

= 3/100 - [(3/30 - 2/30) - (21/75 - 20/75)]

= 3/100 - (1/30 - 1/75)

= 3/100 - (5/150 - 2/150)

= 3/100 - 3/150

= 9/300 - 6/300

= 3/300

= 1/100

Answer 2

$\displaystyle \frac{3}{100} -\Bigg[\Bigg(\frac{^{3)}1}{10} -\frac{^{2)}1}{15} \Bigg)-\Bigg(\frac{^{3)}7}{25}-\frac{^{5)}4}{15} \Bigg)\Bigg]=\frac{3}{100} -\Bigg(\frac{3-2}{30} -\frac{3 \cdot 7-5\cdot 4}{75} \Bigg)=\\\\=\frac{3}{100} -\Bigg(\frac{1}{30} -\frac{21-20}{75} \Bigg)=\frac{3}{100} -\Bigg(\frac{^{5)}1}{30} -\frac{^{2)}1}{75} \Bigg)=\frac{3}{100} - \frac{5-2}{150} =\\\\=\frac{^{3)}3}{100}-\frac{^{2)}3}{150} =\frac{3\cdot 3-2 \cdot 3}{300} =\frac{9-6}{300}= \frac{3}{300}^{(3} =\frac{1}{100}$