Question

Ex 16 doar punctele b c și h

Answer 1

Răspuns:

b) $\frac{6}{x+1}$ ∈ Z

x+1 ∈ D₆

x+1 ∈ {1,2,3,6} | -1

x ∈ {0,1,2,5}

c) $\frac{5}{1-x}$ ∈ Z

1-x ∈ D₅

1-x ∈ {1,5} |-1

-x ∈ {0,4} |:(-1)

x ∈ {0,-4}

h) $\frac{-6}{x-2}$ ∈ N

x-2 ∈ D₋₆

x-2 ∈ {-6,-3,-2,-1,1,2,3,6} |+2

x ∈ {-4,-1,0,1,3,4,5,8}

x ∈ N ⇒ x ∈ {0,1,3,4,5,8}

Explicație pas cu pas: