Question

2. Află numărul "a".
{[(3 xa+5) x 3 + 5] x 3+5} x 3 + 5 = 524
Va rog! Rapid! Dau coroana sj ma abonez​

Answer 1

Răspuns: $\red{\large\boxed{\bf a = 4}}$

Explicație pas cu pas:

$\bf \big\{\big[\big(3 \cdot a+5\big) \cdot3 + 5\big] \cdot 3+5\big\} \cdot 3 + 5 = 524$

$\bf \big\{\big[\big(3 \cdot a+5\big) \cdot3 + 5\big] \cdot 3+5\big\} \cdot 3 = 524-5$

$\bf \big\{\big[\big(3 \cdot a+5\big) \cdot3 + 5\big] \cdot 3+5\big\} \cdot 3 = 519~~~\bigg|:3$

$\bf\big[\big(3 \cdot a+5\big) \cdot3 + 5\big] \cdot 3+5= 173$

$\bf\big[\big(3 \cdot a+5\big) \cdot3 + 5\big] \cdot 3= 173-5$

$\bf\big[\big(3 \cdot a+5\big) \cdot3 + 5\big] \cdot 3= 168~~~\bigg|:3$

$\bf \big(3 \cdot a+5\big) \cdot3 + 5= 56$

$\bf \big(3 \cdot a+5\big) \cdot3 = 56-5$

$\bf \big(3 \cdot a+5\big) \cdot3 = 51~~~\bigg|:3$

$\bf 3 \cdot a+5 = 17$

$\bf 3 \cdot a = 17 -5$

$\bf 3 \cdot a = 12~~~\bigg|:3$

$\red{\large\boxed{\bf a = 4}}$

Bafta multa !

Answer 2

Răspuns:

{[(3×a+5)×3+5]×3+5]×3=524-5

{[(3×a+5)×3+5]×3+5]×3=519

[(3×a+5)×3+5]×3+5=519:3

[(3×a+5)×3+5]×3+5=173

[(3×a+5)×3+5]×3=173-5

[(3×a+5)×3+5]×3=168

(3×a+5)×3+5=168:3

(3×a+5)×3+5=56

(3×a+5)×3=56-5

(3×a+5)×3=51

3×a+5=51:3

3×a+5=17

3×a=17-5

3×a=12

a=12:3

a=4