Question

Ajutor..cat mai repede va rog

Answer 1

a) x+3∈D36. D36={1,2,3,4,6,9,12,18,36} => x+3=1=>x=-2 ∉N*, x+3=2 =.x=-1∉N *, x+3=3=>x=0 ∉N *, X+3=4 =>X=1, X+3=6=>x=3, x+3=9=>x=6 , x+3=12=>x=9 , x+3=18=>x=15, x+3=36=>x=33 =>A={1,3,6,9,15,33}:::: D) 2x+1∈D15, D15=1,3,5,15 => 2X+1=1 =>X=0, 2X+1=3=>X=1, 2X+1=5 =>X=2 si 2x+1=15 =>x=7 =>D={1,2,7}::::e) 2x+3∈D21 ,, D21=1,3,7,21 =>2X+3=1=>X=-1,,,2X+3=3=>;X=0,, 2X+3=7=>X=2 SI 2X+3=21=>X=9 =>E={2,9},,,,G) (3X+6+5)/X+2=3(X+2)/(X+2) +5/(X+2)=3 + 5/(X+2) => X+2∈D5,,D5={1,5} => X+2=1=>X=-1 SI X+2=5=>X=3 ==>G={3}