Question

aflati valoarea expresiei dau coroana​

Answer 1

Răspuns:

a)5

b) 4.1

Explicație pas cu pas:

a) $\left(16.5-\frac{13\cdot9+7}{9}\right)\cdot\frac{6}{11}+2.2\left(\frac{8}{33}-\frac{1}{11}\right)+\frac{3\cdot11+2}{11}$

$=\left(\frac{33}{2}-\frac{124}{9}\right)\cdot\frac{6}{11}+\frac{11}{5}\cdot\frac{5}{33}+\frac{35}{11}$

$=\frac{49}{18}\cdot\frac{6}{11}+\frac{1}{3}+\frac{35}{11}$

$=\frac{49}{3}\cdot\frac{1}{11}+\frac{1}{3}+\frac{35}{11}$

$=\frac{49}{33}\cdot\frac{1}{11}+\frac{1}{3}+\frac{35}{11}=5$

b)$\frac{\left(1\frac{1}{7}-\frac{23}{49}\right)}{\frac{22}{147}}-\left(0.6+3\frac{3}{4}\right)\cdot2\frac{1}{2}=$

$=\left(\frac{8}{7}-\frac{23}{49}\right)\cdot\frac{147}{22}-\left(\frac{\frac{3}{5}}{\frac{15}{4}}\right)\cdot\frac{5}{2}$

$=\frac{33}{49}\cdot\frac{147}{22}-\left(\frac{3}{5}\cdot\frac{4}{15}\right)\cdot\frac{5}{2}$

$=3\cdot\frac{3}{2}-\left(\frac{1}{5}\cdot\frac{4}{5}\right)\cdot\frac{5}{2}$

$=\frac{9}{2}-\frac{4}{25}\cdot\frac{5}{2}$

$=\frac{9}{2}-\frac{2}{5}$

$=\frac{41}{10}=4.1$