Question

pfvr conta montada de casa questão​

Answer 1

Resposta:

Explicação passo a passo:

$1-\ a)\ \frac{5}{8}\ +\ \frac{7}{4}\\\\MMC\ entre\ 8\ e\ 4\ =\ 8\\\frac{(8/8)*(5)+(8/4)*(7)}{8}\\\\\frac{5+14}{8}\\\\\frac{19}{8}$

$b)\ \frac{5}{7}\ -\ \frac{2}{9}\\\\MMC\ entre\ 7\ e\ 9\ =\ 63\\\\\frac{(63/7)*(5)-(63/9)*(2)}{63}\\\\\frac{(9*5)-(7*2)}{63}\\\\\frac{45-14}{63}\\\\\frac{31}{63}\\\\Simplificando: \\\\\frac{1}{2}$

$c)\ (+\frac{5}{7})+(+\frac{2}{9})\\\\MMC=63\\\\\frac{(63/7)*(5)+(63/9)*(2)}{63} \\\\\frac{45+14}{63}\\\\ \frac{59}{63}$

$d)\ (-\frac{9}{7})+(-\frac{9}{7})\\\\ \frac{-9}{7}- \frac{9}{7}\\\\\frac{-18}{7}$

$e)\ (-\frac{4}{5}-(-\frac{3}{7}))\\\\\frac{-4}{5}+\frac{3}{7}\\\\MMC\ =\ 35\\\\\frac{(35/5)*(-4)+(35/7)*(3)}{35} \\\\\frac{(7*(-4))+(5*3)}{35}\\\\\frac{-28+15}{35}\\\\\frac{-13}{35}$

$2-\ a)\ \frac{3}{2}*\frac{1}{5}\\\\= \frac{3*1}{2*5}\\\\= \frac{3}{10}$

$b) \frac{1}{5}*\frac{2}{7} \\\\\frac{1*2}{5*7} \\\\\frac{2}{35}$

$c) \frac{7}{12}*\frac{2}{35}\\\\ \frac{7*2}{12*35}\\\\\frac{1*1}{6*5}\\\\ \frac{1}{30}$

$d) (-\frac{2}{10})* (\frac{13}{10})\\\\ \frac{2*13}{10*10}\\\\\frac{1*13}{5*10}\\\\ \frac{13}{50}$

$e)\ (-\frac{19}{10})* (-\frac{12}{100}) \\\\\frac{-19}{10}*(-\frac{3}{25})\\\\ \frac{(-19)*(-3)}{(10*25)} \\\\\frac{57}{250}$

$3-\ a)\ \frac{\frac{5}{2}}{\frac{4}{10} } \\\\\frac{5}{2} * \frac{10}{4}\\\\\frac{5*10}{2*4}\\\\ \frac{50}{8} \\\\\frac{25}{4}$

$b)\ \frac{\frac{1}{2} }{-\frac{3}{5} }\\\\\frac{1}{2}*(-\frac{5}{3})\\\\\frac{1*(-5)}{(2*3)}\\\\-\frac{5}{6}$

$c)\ \frac{(-\frac{9}{7} )}{\frac{-1}{3} } \\\\(-\frac{9}{7})*(-\frac{3}{1})\\\\\frac{(-9)*(-3)}{(7*1)}\\\\ \frac{27}{7}$

$d)\ \frac{\frac{15}{10} }{\frac{12}{10} }\\\\ \frac{15}{10}*\frac{10}{12} \\\\\frac{15*10}{10*12}\\\\\frac{15}{12}\\\\\frac{5}{4}$

$e)\ \frac{\frac{5}{10} }{35}\\\\\frac{5}{10}*\frac{1}{35}\\\\\frac{5*1}{10*35}\\\\\frac{1*1}{2*35}\\\\\frac{1}{70}$