Question

efetue as operações com as frações:
a) 3 ,,,2
,,,,,_ + _
,,,,,10 ,,5

b) 1 ,,,5 ,,10
,,,,_+ _ + _
,,,,3 ,,12 ,,15

c) 10,, 2
,,,,,_ + _
,,,,12 ,,,3

essas virgulas sao o espaço só

Answer 1

Resposta:

a)

$\dfrac{3}{10} + \dfrac{2}{5} = \\ \\ \dfrac{1 \times 3 + 2 \times 2}{10} = \\ \\ \dfrac{3 + 4}{10} = \\ \\ \pink{\dfrac{7}{10} }$

b)

$\dfrac{1}{3} + \dfrac{5}{12} + \dfrac{10 \div 5}{15 \div 5} = \\ \\ \dfrac{1}{3} + \dfrac{5}{12} + \dfrac{2}{3} = \\ \\ \frac{4 \times 1 + 1 \times 5 + 4 \times 2}{12} = \\ \\ \dfrac{4 + 5 + 8}{12} = \\ \\ \pink{ \dfrac{17}{12} }$

c)

$\dfrac{10 \div 2}{12 \div 2} + \dfrac{2}{3} = \\ \\ \dfrac{5}{6} + \dfrac{2}{3} = \\ \\ \dfrac{1 \times 5 + 2 \times 2}{6} = \\ \\ \dfrac{5 + 4}{6} = \\ \\ \dfrac{9 \div 3}{6 \div 3} = \\ \\ \pink{ \dfrac{3}{2}}$

Bons Estudos!