Question

rezolvati inecuatiile a) x+4<9 b) 2x +3 <10 c) 8x +7 ≤13 d) 4≤x +2 ≤10 unde × este număr natural nenul

Answer 1

a) x+4<9⇒x<5
b)2x+3<10⇒2x<7⇒x<3
c) 8x+7≤13⇒8x≤6 ⇒x≤0
d) 3≤x+2≤10 ⇒ 1≤x≤8

Answer 2

x<9-4⇒x<5⇒x={0,1,2,3,4}
2x+3<10⇒2x<10-3⇒x<7/2⇒x={,0,1,2}
8x+7≤13⇒8x≤13-7⇒x≤6/8⇒x≤3/4
4≤x+2≤10  x≥4   x+2≤10⇒x≤8⇒x={4,5,6,7,8}