Question

Efetue e faz a conta


A) 3/2 - (1/3 + 1/2) - (1/5) =


B) 4 - (2/3 - 2) + (-1/2+ 1/3) =


C) 3/4 - (-2/3) • ( -1/2) =


D) 4 •(-3/4) • (+4/5) =


E) (-3/2) + (-1/2) =


F) (2/3 - 1/2) + (3/2 - 1/4) =


G) 1/2- (-1/2) + (-1/2) =


H) (-3/2) : (-3/4) =


I) (-4/5) : (-2/5) =



Me ajuda por favor eu preciso para amanhã !!! Uma dica tem que fazer o MMC

Answer 1

$A)\\ \\ \frac{3}{2} -(\frac{1}{3} +\frac{1}{2} )-(\frac{1}{5} )=\\ \\ resolva~a~adicao~dentro~dos~parenteses:\\ \\ \frac{1}{3} +\frac{1}{2} \\ \\ mmc=6\\ \\ \frac{2+3}{6} =\frac{5}{6} \\ \\ \frac{3}{2} -\frac{5}{6} -\frac{1}{5} \\ \\ mmc=30\\ \\ \frac{45-25-6}{30} =\frac{14}{30} =\frac{7}{15}$

$B)\\ \\ 4-(\frac{2}{3} -2)+(-\frac{1}{2} +\frac{1}{3} )\\ \\ resolva~as~operacoes~dentro~dos~parenteses:\\ \\ mmc=3~e~6\\ \\ 4-(\frac{2-6}{3} )+(\frac{-3+2}{6} )=4-(-\frac{4}{3} )+(-\frac{1}{6} )\\ \\ observe~os~sinais~+~e~-\\ \\ 4+\frac{4}{3} -\frac{1}{6} \\ \\ mmc=6\\ \\ \frac{24+8-1}{6} =\frac{31}{6}$

$C)\\ \\ \frac{3}{4} -(-\frac{2}{3} ).(-\frac{1}{2} )\\ \\ primeiro~a~multiplicacao~(cuidado~com~os~sinais~+~-)\\ \\ \frac{3}{4} -(-\frac{2}{3} .-\frac{1}{2} )=\frac{3}{4} -(+\frac{2}{6} )=\frac{3}{4} -\frac{2}{6} \\ \\ mmc=12\\ \\ \frac{9-4}{12} =\frac{5}{12}$

$D)\\ \\ 4.(-\frac{3}{4} ).(+\frac{4}{5} )\\ \\ cuidado~com~os~sinais~+~e~-\\ \\ -\frac{48}{20} =-\frac{12}{5}$

$E)\\ \\ (-\frac{3}{2} )+(-\frac{1}{2} )\\ \\ fique~atento~aos~sinais~de~+~e~-\\ \\ -\frac{3}{2} -\frac{1}{2} \\ \\ mmc=2\\ \\ \frac{-3-1}{2} =-\frac{4}{2} =-2$

$F)\\ \\ (\frac{2}{3} -\frac{1}{2} )+(\frac{3}{2} -\frac{1}{4} )\\ \\ resolva~primeiro~os~parenteses\\ \\ mmc=6~e~4\\ \\ (\frac{4-3}{6} )+(\frac{6-1}{4} )=\frac{1}{6} +\frac{5}{4} \\ \\ mmc=12\\ \\ \frac{2+15}{12} =\frac{17}{12}$

$G)\\ \\ \frac{1}{2} -(-\frac{1}{2} )+(-\frac{1}{2} )\\ \\ nao~se~esqueca~de~ficar~atento~aos~sinais~+~e~-\\ \\ +\frac{1}{2} +\frac{1}{2}-\frac{1}{2} \\ \\ \frac{1+1-1}{2} =+\frac{1}{2}$

$H)\\ \\ (-\frac{3}{2} ):(-\frac{3}{4} )\\ \\ divisao~de~fracoes:mantenha~uma~fracao~inalterada~e~multiplique~pelo~inverso~da~outra:\\ \\ -\frac{3}{2} :-\frac{3}{4} =-\frac{3}{2} .-\frac{4}{3} ~~~lembre-se:~-~com~-~=~+\\ \\ +\frac{12}{6} =2$

$I)\\ \\ (-\frac{4}{5} ):(-\frac{2}{5} )~~~~mesmo~caso~da~anterior~(H)\\ \\ -\frac{4}{5} :-\frac{2}{5} =-\frac{4}{5} .-\frac{5}{2} ~~~~~lembre-se~que~(-)~vezes~(-)~=~(+)\\ \\ +\frac{20}{10} =2$

Bons estudos!