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Diagnóstico Matemática ITU

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Diagnóstico Matemática ITU

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About this activity

Preguntas para saber cuanto sabés.

Created by

Luis Cecchi
Luis Cecchi
Argentina

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Diagnóstico Matemática ITU
 

Diagnóstico Matemática ITUOnline version

Preguntas para saber cuanto sabés.

by Luis Cecchi
1

Si f(x)=2x+3, ¿cuál es f(4)?

2

En una urna con 3 rojas y 2 azules, ¿cuál es la probabilidad de sacar una roja en un único tiro?

3

En lógica proposicional, ¿¬(¬P) es equivalente a?

4

Resolver 2x - 5 = 9. ¿Qué valor tiene x?

5

En proposiciones, la conjunción P ∧ Q es verdadera cuando

6

Evaluar la expresión 3 + 4 × 2

7

¿Cuánto es? 3(4+2)-5

8

Si 2x+6=16, ¿Cuánto vale (x)?

Escoge una o varias respuestas

9

Una remera cuesta $20.000 y tiene un descuento del 15%. ¿Cuál es el precio final?

10

Si una función es y=2x+3, ¿cuánto vale y cuando x=4?

Explicación

f(4)=2·4+3=11. 10 es con 2x+2, 14 es 2·4+6, 9 sería 2·4+1.

Hay 3 rojas de 5 bolas; probabilidad = 3/5. Las demás son incorrectas.

La doble negación elimina la negación.

2x=14 → x=7. Las otras no satisfacen la ecuación.

Conjunción requiere que ambas sean verdaderas.

Multiplicación antes de suma: 3+8=11.

Primero resolvemos el paréntesis: 4 + 2 = 6. Luego multiplicamos: 3 × 6 = 18. Finalmente restamos 5: 18 − 5 = 13.

Restamos 6 a ambos lados: 2x = 10. Luego dividimos por 2: x = 5.

El 15% de $20.000 es $3.000. Entonces: $20.000 − $3.000 = $17.000.

Reemplazamos x por 4: y = 2 × 4 + 3 = 8 + 3 = 11.

 
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