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Prueba de Matemáticas: Noveno

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About this activity

10 preguntas de nivel medio

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Colombia

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Prueba de Matemáticas: Noveno
 

Prueba de Matemáticas: NovenoOnline version

10 preguntas de nivel medio

by Juan Carlos Gil castaño
1

Resolver 2x - 3 = 7. ¿Cuál es x?

2

Factoriza x^2 - 6x + 9.

3

Raíz cuadrada de 144.

4

Si y = 3x + 2, ¿qué es y cuando x = 4?

5

Área de un rectángulo de base 5 y altura 3.

6

Perímetro de un triángulo con lados 3, 4 y 5.

7

Propiedad de potencias: a^2 · a^3 =

8

Resolver 2x + 3 = x + 9: x =

9

Término de una progresión aritmética con a1 = 2 y d = 4, ¿a5?

10

Área de un círculo con radio r = 3: A ≈

Explicación

Despeja sumando 3 a ambos lados y luego divide entre 2.

Es un trinomio cuadrado perfecto: (x-3)^2.

12^2 = 144.

Reemplaza x por 4: y = 3(4) + 2 = 14.

Área = base × altura = 5 × 3 = 15.

Suma de lados: 3+4+5 = 12.

Se suman los exponentes al multiplicar bases iguales.

Resta x y resta 3 de ambos lados.

a_n = a1 + (n-1)d = 2 + 4×4 = 18.

A = πr^2 ≈ 3.1416×9 ≈ 28.27 ≈ 28.3.

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