Question

4/15 x 3/2 - 1/2 x 5/4 = ?
10/9 : 5/3 - 2/5 = ?
(4/1 + 1/3) : (4/1 - 1/3) = ?
5/4 + 1/4 - 2/4 = ?
6/5 - 1/2 x 3/4 = ?
(1/8 + 3/4 + 1/2) : 2 = ?
6 - 5/2 x 2 = ?

Answer 1

$\frac{10}{9} : \frac{5}{3} - \frac{2}{5} = \frac{10}{9} . \frac{3}{5} - \frac{2}{5} = \frac{2}{3} - \frac{2}{5} = \frac{10}{15} - \frac{6}{15} = \frac{4}{15}$

$( \frac{4}{1} + \frac{1}{3}) : ( \frac{4}{1} - \frac{1}{3}) = ( \frac{12}{3} + \frac{1}{3}) : (\frac{12}{3} - \frac{1}{3}) = \frac{13}{3} : \frac{11}{3} = \frac{13}{3} . \frac{3}{11} = \frac{13}{11}$

$\frac{5}{4} + \frac{1}{4} - \frac{2}{4} = \frac{6}{4} - \frac{2}{4} = \frac{4}{4} = 1$

$\frac{6}{5} - \frac{1}{2} . \frac{3}{4} = \frac{6}{5} - \frac{3}{8} = \frac{48}{40} - \frac{15}{40} = \frac{33}{40}$

$( \frac{1}{8} + \frac{3}{4} + \frac{1}{2}) : 2 = (\frac{1}{8} + \frac{6}{8} + \frac{4}{8}) : 2 = \frac{7}{8} + \frac{4}{8} : 2 = \frac{11}{8} . \frac{1}{2} = \frac{11}{16}$

$6- \frac{5}{2}.2 = 6-5= 1$
 
Espero ter ajudado. ;*