Question

Aflați x din egalitatea:
2•5²‐5•[9+5-3•(2x-2010⁰)]=25

Answer 1

Răspuns:  x = 2

Explicație pas cu pas:

2•5²‐5•[9+5-3•(2x-2010⁰)]=25

2 × 25 - 5× [14 - 3 × (2x - 1)] = 25

50 - 5× [14 - 3 × (2x - 1)] = 25

5× [14 - 3 × (2x - 1)] = 50 - 25

5× [14 - 3 × (2x - 1)] = 25

14 - 3 × (2x - 1) = 25 : 5

14 - 3 × (2x - 1) = 5

3 × (2x - 1) = 14 - 5

3 × (2x - 1) = 9

2x - 1 = 9 : 3

2x - 1 = 3

2x= 3 + 1

2x = 4

x = 4 : 2

x = 2