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Rezolvati in N ecuatiile: a) 5x-125=0; b) 3x+7=0.

Răspuns :

[tex]a)5x - 125 = 0[/tex]

[tex]5x = 125 \: | \div 5[/tex]

[tex]x = 25 \: \in \: \mathbb{N}[/tex]

[tex]b)3x + 7 = 0[/tex]

[tex]3x = - 7[/tex]

[tex]x =- \frac{7}{3} \: \notin \: \mathbb{N}[/tex]
a) 5x - 125 = 0

5x = 125

x = 125 : 5

x = 25 
∈ N

b) 3x + 7= 0

3x = -7

x = -7 : 3

x = -7/3 
∉ N