Question

V. Dacă a= 14/10 și b = 3,5 calculați:
● a) a²:b+a;

● c) (-a) +a+l-al ;

● b) a•b‐¹ - a

● d) -b : b‐¹ + | b | : b‐¹

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Answer 1

Explicație pas cu pas:

a)

${( \frac{14}{10}) }^{2} \div 3.5 + \frac{14}{10} = \\ \frac{196}{100} \div \frac{35}{10} + \frac{14}{10} = \\ \frac{196}{100} \times \frac{10}{35} + \frac{14}{10} = \\ \frac{28}{10 \times 5} + \frac{14}{10} = \\ \frac{28}{50} + \frac{70}{50} = \\ \frac{98}{50} = \frac{49}{25}$

c)

$- \frac{14}{10} + \frac{14}{10} + | - \frac{14}{10} | = \frac{14}{10} = \frac{7}{5}$

b)

$\frac{14}{10} \times {( \frac{35}{10} )}^{ - 1} - \frac{14}{10} = \\ \frac{14}{10} \times \frac{10}{35} - \frac{14}{10} = \\ \frac{2}{7} - \frac{2}{7} = 0$

d)

$- \frac{35}{10} \div ( { \frac{35}{10}) }^{ - 1} + | \frac{35}{10} | \div ( { \frac{35}{10}) }^{ - 1} = \\ - \frac{35}{10} \div \frac{10}{35} + \frac{35}{10} \div \frac{10}{35} = 0$