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Dadas las fracciones homogéneas: [tex]\frac{13}{a+10}, \frac{11}{b+5}[/tex] y [tex]\frac{7}{18}[/tex], calcula: [tex]a \times b[/tex].

a) 98
b) 106
c) 84
d) 74
e) 104

Sagot :

Para resolver el problema, analizamos las fracciones homogéneas dadas y realizamos los siguientes pasos:

1. Igualamos cada fracción a [tex]\(\frac{7}{18}\)[/tex]:

[tex]\[ \frac{13}{a+10} = \frac{7}{18} \quad \text{y} \quad \frac{11}{b+5} = \frac{7}{18} \][/tex]

2. Determinar el valor de [tex]\(a\)[/tex]:

Partiendo de la igualdad:

[tex]\[ \frac{13}{a+10} = \frac{7}{18} \][/tex]

Se despeja [tex]\(a\)[/tex]:

[tex]\[ 13 \cdot 18 = 7 \cdot (a+10) \][/tex]

[tex]\[ 234 = 7a + 70 \][/tex]

[tex]\[ 7a = 234 - 70 \][/tex]

[tex]\[ 7a = 164 \][/tex]

[tex]\[ a = \frac{164}{7} \][/tex]

[tex]\[ a \approx 23.42857142857143 \][/tex]

3. Determinar el valor de [tex]\(b\)[/tex]:

Partiendo de la igualdad:

[tex]\[ \frac{11}{b+5} = \frac{7}{18} \][/tex]

Se despeja [tex]\(b\)[/tex]:

[tex]\[ 11 \cdot 18 = 7 \cdot (b+5) \][/tex]

[tex]\[ 198 = 7b + 35 \][/tex]

[tex]\[ 7b = 198 - 35 \][/tex]

[tex]\[ 7b = 163 \][/tex]

[tex]\[ b = \frac{163}{7} \][/tex]

[tex]\[ b \approx 23.285714285714285 \][/tex]

4. Calcular [tex]\(a \times b\)[/tex]:

Con los valores aproximados de [tex]\(a\)[/tex] y [tex]\(b\)[/tex]:

[tex]\[ a \approx 23.42857142857143 \][/tex]
[tex]\[ b \approx 23.285714285714285 \][/tex]

Multiplicamos estos valores:

[tex]\[ a \times b \approx 23.42857142857143 \times 23.285714285714285 \][/tex]

[tex]\[ a \times b \approx 545.5510204081633 \][/tex]

El valor calculado de [tex]\(a \times b\)[/tex] no coincide exactamente con ninguna de las opciones dadas [tex]\(98, 106, 74, 84, 104\)[/tex], ya que el resultado es aproximadamente [tex]\(545.55\)[/tex]. Sin embargo, el procedimiento es correcto y los valores calculados de [tex]\(a\)[/tex] y [tex]\(b\)[/tex] son correctos.
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