Question

Calculati!! Va roog multt!!!

Answer 1

$a)2.4 \times 4.2 - 3.2 \div \frac{4}{5}$

$= \frac{24}{10} \times \frac{42}{10} - \frac{32}{10} \times \frac{5}{4}$

$= \frac{12}{5} \times \frac{21}{5} - \frac{16}{5} \times \frac{5}{4}$

$= \frac{12 \times 21}{5 \times 5} - \frac{16}{4}$

$= \frac{252}{25} - 4$

$= \frac{1008}{100} - \frac{100}{100}$

$= \frac{1008 - 100}{100}$

$= \frac{908}{100}$

$= \frac{454}{50}$

$= \frac{227}{25}$

$b)4.5 + \frac{31}{10} \times 2.6$

$= \frac{45}{10} + \frac{31}{10} \times \frac{26}{10}$

$= \frac{9}{2} + \frac{31}{5} \times \frac{13}{10}$

$= \frac{9}{2} + \frac{31 \times 13}{5 \times 10}$

$= \frac{9}{2} + \frac{403}{50}$

$= \frac{225}{50} + \frac{403}{50}$

$= \frac{225 + 403}{50}$

$= \frac{628}{50}$

$= \frac{314}{25}$

$c)34.5 + 9.11 - 9.2 \div 6.4 + 3.1(6)$

$= \frac{345}{10} + \frac{911}{100} - \frac{92}{10} \div \frac{64}{10} + \frac{316 - 31}{90}$

$= \frac{69}{2} + \frac{911}{100} - \frac{92}{10} \times \frac{10}{64} + \frac{285}{90}$

$= \frac{69}{2} + \frac{911}{100} - \frac{92}{64} + \frac{57}{18}$

$= \frac{69}{2} + \frac{911}{100} - \frac{46}{32} + \frac{19}{6}$

$=\frac{69}{2} + \frac{911}{100} - \frac{23}{16} + \frac{19}{6}$

$= \frac{41400}{1200} + \frac{10932}{1200} - \frac{1725}{1200} + \frac{3800}{1200}$

$= \frac{41400 + 10932 - 1725 + 3800}{1200}$

$= \frac{54407}{1200}$