Question

va dau coroane ajutatima imi trebuie acum 2 3 4 5​

Answer 1

Răspuns:

Explicație pas cu pas:

Exercițiul 2

$\bf \{120-2\cdot[14+5\cdot(x-3)]\}:4=8~~~\bigg|\cdot4$

$\bf 120-2\cdot[14+5\cdot(x-3)]=8\cdot4$

$\bf 120-2\cdot[14+5\cdot(x-3)]=32$

$\bf 120-32 = 2\cdot[14+5\cdot(x-3)]$

$\bf 88 = 2\cdot[14+5\cdot(x-3)]~~~\bigg|:2$

$\bf 14+5\cdot(x-3) = 44$

$\bf 14+5\cdot(x-3) = 44-14$

$\bf 5\cdot(x-3) = 30~~~\bigg|:5$

$\bf x-3 = 6$

$\bf x = 6+3$

$\red{\boxed{~\bf x=9~}}$

Exercițiul 3

a = 2 · 3³ · 6⁵

a = 2 · 3³ · 2⁵ · 3⁵

a = 2⁵⁺¹ · 3³⁺⁵

a = 2⁶ · 3⁸

a = (2³)² · (3⁴)²

a = (2³ · 3⁴)² → pătrat perfect

Exercițiul 4

a) 3²⁰  si  2³⁰

3²⁰ = (3²)¹⁰ = 9¹⁰

2³⁰ = (2³)¹⁰ = 8¹⁰

9¹⁰ > 8¹⁰  ⇒ 3²⁰  >  2³⁰

==pav38==