Question

3.Să se afle soluţia ecuaţiei: 7× {3× [5× (2x + 3) – 30] + 2} – 19 = 100

Answer 1

Răspuns:

Explicație pas cu pas:

7× {3× [5× (2x + 3) – 30] + 2} – 19 = 100

7× {3× [5× (2x + 3) – 30] + 2} = 100+19

7× {3× [5× (2x + 3) – 30] + 2} = 119

3× [5× (2x + 3) – 30] + 2 = 119 : 7

3× [5× (2x + 3) – 30] + 2 = 17

3× [5× (2x + 3) – 30] = 17 - 2

3× [5× (2x + 3) – 30] = 15

5× (2x + 3) – 30 = 15 : 3

5× (2x + 3) – 30 = 5

5× (2x + 3) = 5 + 30

2x + 3 = 35 : 5

2x + 3 = 7

2x = 7 - 3

2x = 4

x = 4 : 2

x = 2 → soluția ecuației