Question

O valor da expressão
$- \frac{3}{7} + \frac{2}{5}$
é:
$a) - \frac{1}{35}$
$b) \frac{3}{5}$
$c) \frac{1}{35}$
$d) \frac{1}{2}$
$e) - \frac{1}{2}$
COM CÁLCULO​

Answer 1

a)$\red{\large{- \frac{1}{35}}}$

• CÁLCULO

$- \frac{3}{7} + \frac{2}{5} =$

• mmc entre 7 e 5 : 35

$\frac{ - 15 + 14}{35} = \\ \\ \boxed{- \frac{ 1}{35}}$

Answer 2

꧁Hello, how are you?꧂

• Bom... vamos lá, baby!

$- \frac{3}{7} + \frac{2}{5} \\ \\ - \frac{3 \times 5}{7 \times 5} + \frac{2}{5} \\ \\ - \frac{3 \times 5}{7 \times 5} + \frac{2 \times 7}{5 \times 7} \\ \\ - \frac{15}{7 \times 5} + \frac{2 \times 7}{5 \times 7} \\ \\ - \frac{15}{35} + \frac{2 \times 7}{5 \times 7} \\ \\ - \frac{15}{35} + \frac{14}{5 \times 7} \\ \\ - \frac{15}{34} + \frac{14}{35} \\ \\ \frac{ - 15 + 14}{35} \\ \\ \frac{ - 1}{35} \\ \\ - \frac{1}{35}$

${\red{Keep \: loving...}}$

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Signed: Lohany Queen of hell 彡★

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