Question

Calcule a diferença entre as frações:

a) 1/3 – 4/5 =

b) 2/3 – 7/3 =
c) 5/2 – 3/2 =

d) 9/5 – 3/4 =​

Answer 1

Resposta:

Olá bom dia!

Para soma ou diferença entre frações utilize a regra do X.

$\frac{a}{b}-\frac{c}{d} = \frac{a.d -c.b}{b.d}$

a)

$a)\\\\\frac{1}{3} - \frac{4}{5} = \frac{1.5 - 4.3}{15} = \frac{5 - 12}{15} = -\frac{7}{15} \\\\\\b)\\\\\frac{2}{3} - \frac{7}{3} = \frac{2.3 - 7.3}{9} = \frac{6 - 21}{9} = -\frac{15}{9} \\\\= -\frac{5}{3}$

$c)\\\\\frac{5}{2} - \frac{3}{2} = \frac{5-3}{2} = \frac{2}{2} = 1\\\\\\d)\\\\\frac{9}{5} - \frac{3}{4} = \frac{9.3-3.5}{5.4} = \frac{27-15}{20} = \frac{12}{20} \\\\= \frac{3}{5}$