Question

MDC

7) Calcule:

a) 2/3 + 4/5 =

b) 3/4 - 2/7 =

c) (-4/15)x (-5/6)=

d) 6 : 8/3 =​

Answer 1

$a) \frac{2}{3} +\frac{4}{5} = \frac{10}{15} +\frac{12}{10} = \frac{22}{15} = 1\frac{7}{15}$  

$b) \frac{3}{4} - \frac{2}{7}= \frac{12}{28} - \frac{8}{28} = \frac{20}{28} = \frac{5}{7}$

$c) -\frac{4}{15} .-\frac{5}{6} = + \frac{2}{9}$

$d) 6 : \frac{8}{3} = \frac{6}{1} . \frac{3}{8} = \frac{9}{8}$$= 1\frac{1}{8}$