Question

determinati valorile lui x, nr natural, care verifica inegalitatea,
(rezolvati inecuatiile)
a) x+12<15
b) x-7<3
c) 8*x<2
d) x:9<5
e) 2*x+6<7

Answer 1

a) x+12<15⇒x<15-12⇒x<3⇒x∈{0,1,2}
b) x-7<3 ⇒x<3+7⇒x<10⇒x∈{0,1,2,3,4,5,6,7,8,9}
c) 8*x<2⇒x<2/8⇒x=0
d) x:9<5⇒x<9*5⇒x<45⇒x∈{0,1,2,3,.....44}
e) 2*x+6<7⇒2x<7-6⇒2x<1⇒x<1/2⇒x=0