Question

??????????????????????​

Answer 1

Resposta:

a) $-\frac{11}{15}$

b) $\frac{11}{12}$

c) $\frac{1}{6}$

a) $-\frac{1}{15}$

Explicação passo-a-passo:

a) $\frac{3}{5} - \frac{4}{3}$ = $\frac{9}{15} - \frac{20}{15}$ = $-\frac{11}{15}$

(mmc dos denominadores 5 e 3=15)

b) $\frac{2}{3} + \frac{1}{4}$ = $\frac{8}{12} + \frac{3}{12}$ = $\frac{11}{12}$

(mmc dos denominadores 3 e 4=12)

c) $(-\frac{5}{14}$ · $-\frac{7}{15})$ = $\frac{(-5) . (-7)}{(-14) . (-15)}$ = $+\frac{35}{210} = \frac{7}{42} = \frac{1}{6}$

a) $\frac{6}{25} : (-\frac{18}{5}) = \frac{6}{25} . (-\frac{5}{18}) = -\frac{30}{450} = -\frac{15}{225} = -\frac{3}{45} = -\frac{1}{15}$