Question

Calcule:
a) 1/2 + 4/5
b) 2/3 + 7/3
c) 5/6 + 1/2
d) 9/5 - 3/4
e) 13/5 - 7/5
f) ¼ × 2/3
g) 3/5 : ¼
h) (-3/5)²​​

Answer 1

Resposta:

a)

$\frac{1}{2} + \frac{4}{5} = \frac{5 + 2}{10} = \frac{7}{10}$

b)

$\frac{2}{3} + \frac{7}{3} = \frac{2 + 7}{3} = \frac{9}{3} = 3$

c)

$\frac{5}{6} + \frac{1}{2} = \frac{5 + 3}{6} = \frac{8}{6} = \frac{4}{3}$

d)

$\frac{9}{5} - \frac{3}{4} = \frac{36 - 15}{20} = \frac{21}{20}$

e)

$\frac{13}{5} - \frac{7}{5} = \frac{13 - 7}{5} = \frac{6}{5}$

f)

$\frac{1}{4} \times \frac{2}{3} = \frac{2}{12} = \frac{1}{6}$

g)

$\frac{3}{5} \div \frac{1}{4} = \frac{3}{5} \times \frac{4}{1} = \frac{12}{5}$

h)

$( \frac{ - 3}{5} )^{2} = ( - \frac{3}{5} ) \times ( - \frac{3}{5} ) = \frac{9}{25}$