Question

EXERCÍCIOS- CALCULE AS OPERAÇÕES COM NÚMEROS RACIONAIS Calcule: a) −1−3/4= b) −2/3+1/2−1/4= c) −3/2−4/5+1/2= d) (−5/8).(−4/3)= e) (+4/5).(−1/3)= f) (−3/5).(−7/4)= g) (+1/9):(−7/5)= h) (+1/2):(−3/4)= i) (−3/4):(−3/4)= j) (−1/2).(+2/3).(−3/7)= Me ajudem por favorr

Answer 1

a-)$-1-\frac{3}{4} =-\frac{4}{4} -\frac{3}{4}=\frac{1}{4}$ ;

b-)$-\frac{2}{3} +\frac{1}{2} -\frac{1}{4} =?$; definindo base com 12;

$-\frac{8}{12} +\frac{6}{12} -\frac{3}{12} =-\frac{5}{12}$

c-)$-\frac{3}{2}-\frac{4}{5} +\frac{1}{2} =?$; definindo base com 10;

$-\frac{15}{10} -\frac{8}{10} -\frac{5}{10} =-\frac{28}{10} =-\frac{14}{5}$

d-)$(-\frac{5}{8}) (-\frac{4}{3})=\frac{20}{24} =\frac{5}{7}$

e-) $(\frac{4}{5})(-\frac{1}{3} )=-\frac{4}{15}$

f-) $(-\frac{3}{5})(-\frac{7}{4})=\frac{21}{20}$

g-)$\frac{\frac{1}{9}}{-\frac{7}{5} }=(\frac{1}{9}).(-\frac{5}{7} )=-\frac{5}{63}$

h-)$\frac{\frac{1}{2}}{-\frac{3}{4}} =(\frac{1}{2}).(-\frac{4}{3})=-\frac{4}{6} =\frac{2}{3}$

i-)$\frac{-\frac{3}{4} }{-\frac{3}{4} }=1$

j-)$(-\frac{1}{2}).(\frac{2}{3} ).(-\frac{3}{7} )=\frac{6}{42} =\frac{1}{7}$