Question

se a =3/4 e b=2/5 entao a +b e a × b sao resectivamente e iguai a 23/20 e 5/9
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Answer 1

Resposta:

a=3/4 b=2/5

$a + b = \\ \frac{3}{4} + \frac{2}{5} = \frac{5 \times 3 + 4 \times 2}{20} = \frac{15 + 8}{20} = \frac{23}{20}$

$a \times b = \frac{3}{4} \times \frac{2}{5} = \frac{6}{20} = \frac{6 \div 2}{20 \div 2} = \frac{3}{10}$

espero que isso ajude vc

Answer 2

Explicação passo-a-passo:

Oi, Td bem?

$a + b$

$para$

$a = \dfrac{3}{4}$

$e$

$b = \dfrac{2}{5}$

$\dfrac{3}{4} + \dfrac{2}{5}$

$\dfrac{18 + 5}{20}$

23/20

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$a \times b$

$para$

$a = \dfrac{3}{4}$

$e$

$b = \dfrac{2}{5}$

$\dfrac{3}{4} \times \dfrac{2}{5}$

$\dfrac{6 {}^{ \div 2} }{20 {}^{ \div 2} }$

3/10

Espero ter ajudado!