Question

a)+2/3 + -1/5 b) -3/8 + -1/10 c) (+50,40)-(+3,0,9)-(+15,8) d) -1/4 - -4/5 e) +1/2 - -2/9 +(-7)

Answer 1

Resposta:

$a)\\ \\ \frac{2}{3} +\frac{-1}{5} \\ \\ mmc=15\\ \\ \frac{10+(-3)}{15} =\frac{10-3}{15} =\frac{7}{15} \\ \\\\ b)\\ \\ \frac{-3}{8} +\frac{-1}{10} =\\ \\ mmc=40\\ \\ \frac{-15+(-4)}{40} =\frac{-15-4}{40} =\frac{-19}{40} =-\frac{19}{40} \\ \\ \\ c)\\ \\ (50,40)-(+30,9)-(+15,8)=50,4-30,9-15,8=+3,7\\ \\ \\ d)\\ \\ \frac{-1}{4} -\frac{-4}{5} =\\ \\ mmc=20\\ \\ \frac{-5-(-16)}{20} =\frac{-5+16}{20} =+\frac{11}{20} \\ \\ e)\\ \\ \frac{1}{2} -\frac{-2}{9} +(-7)=\\ \\ mmc=18$

$\frac{9-(-4)+(-126)}{18} =\frac{9+4-126}{18} =\frac{-113}{18} =-\frac{113}{18}$