Question

Rezolvati inecuatiile in N:
a)x:1.3<0.2
b)7.29:x>0.81; x#0
c)4x-1.2<1.6
d)7,24<3x-2<16

Answer 1

a)x<0,2·1,3
x<0,26
x∈N=>X={0}
b)x>0,81:7,29
x>0,(1)
x∈N*=>x={1,2,3...,∞}
c)4x<1,6+1,2
4x<2,8
x<2,8:4
x<0,7
x∈N=>x={0}
d)7,24+2<3x<16+2
9,24<3x<18 /:3
3,08<x<6
x∈N=>x={4,5}
Sper ca te-am ajutat ;D
Succes!!

Answer 2

a)x:1,3<0,2⇔x<1,3x0,2⇔x<0,26 ⇒x<1
b)7,29:x>0,81⇔x>7,29x0,81⇔x>5,9049⇒x>6
c)4x-1,2<1,6⇔4x<2,8⇔x<0,7⇒x<1
d)7,24<3x-2⇔9,24<3x⇔x<3,8⇒x<4
   3x-2<16⇔3x<18⇔x<6⇒x=6