Question

1,2,3 VA ROG ERGENT!!!!!!!!!!!

Answer 1

1)
2x+11=3x+5
3x-2x=11-5
x=6⇒6∈N
2)
5x+1<3x+9
5x-3x<9-1
2x<8
x<8/2
x<4
x∈N
x=0;1;2;3⇒0∈N⇒1∈N⇒2∈N⇒3∈N
3)
(2x+1)/3=(5x-1)/6
6(2x+1)=3(5x-1)
12x+6=15x-3
15x-12x=6+3
3x=9
x=9/3
x=3⇒3∈N