Question

determinati numerele naturale x stiind ca;      7x-3< 5x+13    ;2x+4< X+16  ;

Answer 1

1) 7x - 3 < 5x + 13 ⇔ 7x - 5x < 13 + 3 ⇔ 2x < 16 ⇔ x < 16/2 ⇔
   x < 8 ⇒ x ∈ ( - 00, 8), numerele naturale sunt N ∧ ( -00, 8)⇒
   x ∈ { 0,1,2,3,4,5,6,7}

2) 2x + 4 < x + 16 ⇔ 2x - x < 16 - 4 ⇔ x < 12 ⇒ x ∈ ( - 00, 12)
   numerele naturale sunt N∧ ( - 00, 12) ⇒
   x ∈ {0,1,2,3,4,5,6,7,8,9,10,11}
 Sper ca ti-am fost de ajutor!

Answer 2

7x-3<5x+3 ; 7x-5x<13+3 ; 2x<16 ; x<16:2 ; x<8 . 
2x+4<x+16 ; 2x-x<16-4 ; x<12 ; 
x∈{0,1,2,3,4,5,6,7,8,9,10,11}