Question

(X+1) divide/ 18 si 21 multiplu :° (x +2)

Answer 1

Răspuns:

D₁₈={1 ,2 ,3 ,6 ,9, 18}

x+1=1=>x=1-1=>x=0

x+1=2=>x=2-1=>x=1

x+1=3=>x=3-1=>x=2

x+1=6=>x=6-1=>x=5 nu convine

x+1=9=>x=7 nu convine

x+1=18=>x=17 nu convine

x∈{0,1,2}

___________

M₂₁=21,42,63,84,105,126....

x+2=21=>x=21-2=>x=19

x+2=42=>x=40

x=19,40,61,82,103,124...