Question

1]Rezolvati in multimea numerele naturale inecuatiilea] 2x+5=17 b]19-2x=9 c]3x-8=7 d] 16+x:1=12

2]Determinati x numar natural.din 
a]3{x-2}≤10 b] {x+4}*6-24≤12
c]144:{x-5}>9 si x:7>2
d]3x≤27 si 4x≥12
e] [{x-144:12}x3-2]:7≤ 4
f]2 ≤ x ≤ 10 si 3x-4≥23

3]Rezolvati in multimea numerelor naturale


ajutorrrr va rog 

Answer 1

1) a) 2x + 5 = 17 ⇔ 2x = 17 - 5 ⇔2x = 12⇔x = 12/2⇔x = 6
   b) 19- 2x = 9⇔- 2x = 9 -19 ⇔ - 2x = - 10⇔ x = ( - 10): ( - 2)⇔s = 5
  c) 3x - 8 = 7 ⇔ 3x = 7 + 8⇔3x = 15⇔x = 15/3⇔ x =5
   d) 16 + x:1 = 12⇔ 16 + x = 12⇔x = 12 - 16⇔ x = - 4
2) a) 3( x - 2) ≤ 10 ⇔3x - 6≤10⇔3x≤10 + 6⇔x ≤ 16/3, x∈( - 00, 16/3]
   16/3 = 5,3, x∈N ⇒ x ={0,1,2,3,4,5}
   b) ( x + 4)·6 - 24≤ 12⇔6x + 24 - 24 ≤ 12⇔ 6x ≤12⇔ x ≤12/6⇔x≤2,
       x∈ ( - 00, 2], x∈N ⇒ x ={ 0,1,2}
   asa le faci pe urmatoarele