Question

determinati numarul natural necunoscut x. din fiecare inegalitate de mai jos:

a; 19 + x ≤ 43

b; 28 - x ≥ 11

c x + 38 -18 mai mare ca 83

d; 41 + x - 39 mai mare ca 83-77

ajutati ma va rog

Answer 1

a)19+x≤43⇒x≤43-19⇒x≤24
b)28-x≥11⇒28-11≥x⇒17≥x⇒x≥17
c)x+38-18>83⇒x+20>83⇒x>83-20⇒x>63
d)41+x-39>83-77⇒2+x>6⇒x.6-2⇒x>4
sucees

Answer 2

a) 19+x≤43
   x≤43-19
   x≤24
x={0,1,2,...23,24}

b) 28-x≥11
    28-11≥x
   17≥x
   x={0,1,2....16,17}

c) x+38-18>83
    x+20>83
    x>83-20
    x>63
   x={0,1,2,...62}

d) 41+x-39>83-77
    41+x-39>6
    x-39>41-6
     x-39>35
     x>39-35
     x>4
   x={5,6,7, ...n...}