Question

Rezolvati in multimea nr nat ecuatiilor urmâtoâre. d) [25(36x-11x)]: 125=500,, e) (12x) :4=30,,, f) (3x + 7x) : 2 = 15 va rog

Answer 1

 d) [ 25 ( 36x - 11x)] : 125 = 500
     ( 25 · 25x) : 125 = 500
     625x : 125 = 500
     5x = 500
     atunci x = 500:5
     atunci x = 100 ∈ N
e) ( 12x) : 4 = 30
     3x = 30
     atunci x = 30:3
     atunci x = 10 ∈ N
f) ( 3x + 7x) : 2 = 15
     10x : 2 = 15
     5x = 15
     atunci x = 15:5
     atunci x = 3 ∈N