Question

3 - O valor da expressão a+b/ab para a)⅓ e b)⅖ é igual a

a) 1 ½.

b) 3 ½.

c) 5 ½.

d) 7 ½.

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Answer 1

Explicação passo-a-passo:

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$\text{Resolvendo a express\~ao para }a=\dfrac{1}{3}\ \text{e}\ b=\dfrac{2}{5}.\\\\E=\dfrac{a+b}{ab}\\\\\\E=\dfrac{\dfrac{1}{3} +\dfrac{2}{5} }{\dfrac{1}{3}.\dfrac{2}{5} } \\\\\\E=\dfrac{\dfrac{5}{15} +\dfrac{6}{15} }{\dfrac{2}{15} }\\\\\\E=\dfrac{\dfrac{11}{15} }{\dfrac{2}{15} }\\\\\\E=\dfrac{11}{15} .\dfrac{15}{2} \\\\\\E=\dfrac{11}{2}\\\\\\\boxed{\boxed{E= 5\dfrac{1}{2} }}$

Resposta C