Question

4. Determină numărul a din egalitatea:
460 - [6 x 8+ (3 x a + 15) + 7 x 8] x 3 = 58​

Answer 1

[6×8+(3×a+15)+7×8]×3=460-58

6×8+(3×a+15)+7×8=402÷3

48+(3×a+15)+7×8=134

(3×a+15)+56=134-48

3×a+15=86-56

3×a+15=30

3×a=30-15

3×a=15

a=15:3

a=5

Sper că te-am ajutat!

Answer 2

Răspuns: a = 5

Explicație pas cu pas:

$\bf 460 - [ 6 \times 8 + (3 \times a + 15) + 7 \times 8 ] \times 3 = 58$

$\bf 460 - [ 48 + (3 \times a + 15) + 56 ] \times 3 = 58$

$\bf [ 48 + (3 \times a + 15) + 56 ] \times 3 = 460 - 58$

$\bf [ 48 + (3 \times a + 15) + 56 ] \times 3 = 402$

$\bf 48 + (3 \times a + 15) + 56 = \frac{402}{3}$

$\bf 48 + (3 \times a + 15) + 56 = 134$

$\bf 48 + (3 \times a + 15) = 134 - 56$

$\bf 48 + (3 \times a + 15) = 78$

$\bf 3 \times a + 15 = 78 - 48$

$\bf 3 \times a + 15 = 30$

$\bf 3 \times a = 30 - 15$

$\bf 3 \times a = 15$

$\bf a = \frac{15}{3} \Rightarrow \red{ \boxed{ \bf a = 5} }$