Question

Calcule as seguintes operações:
a) 4/9 - 2/3=
b) 3/4 + 7/8=
c) +4/10 - 1/5=
d) 7/5 - 5/3=
e) -7/12 + 5/3=
f) -3/4 +9/5=
g) -3/5 + 7/8 - 1 + 11/10=
h) 4/9 - 5/6 - 2/3 + 3/2=
i) 3/5 + 12/10=
​

Answer 1

A)

$\frac{4}{9} - \frac{4}{9} = \\ \frac{0}{9} =\\0$

B)

$\frac{6}{8} + \frac{7}{8} =\\\frac{13}{8}$

C)

$\frac{4}{10} - \frac{2}{10} = \\\frac{2}{10} = \\\frac{1}{5}$

D)

$\frac{21}{15} - \frac{25}{15} = \\\frac{-4}{15}$

E)

$\frac{-7}{12} + \frac{20}{12} = \\\frac{13}{12}$

F)

$\frac{-15}{20} +\frac{36}{20} = \frac{21}{20}$

G)

$\frac{-24}{40} + \frac{35}{40} \frac{-40}{40} + \frac{44}{40} =\\\frac{11}{40} + \frac{4}{40} =\\\frac{15}{40}= \\\frac{3}{8}$

H)

$\frac{8}{18} - \frac{15}{18} - \frac{12}{18} + \frac{27}{18} = \\\frac{-7}{18} + \frac{15}{18} = \\\frac{8}{18} =\\\frac{4}{9}$

I)

$\frac{6}{10} + \frac{12}{10} = \frac{18}{10} =\\\frac{9}{5}$