Question

Ajutor! Este urgent! Dau 60 puncte..Va rog mult

Answer 1

A

(x-7)|39=> x-7∈ D39={ 1, 3, 13, 39) |+7 adunam 7

x∈{8,10,20,46}=A

B

(x+4)∈D24=> x+4∈{1, 2, 3, 4, 6, 8, 12, 24}|-4

x∈{-3, -2, -1, 0, 2, 4, 8, 20}

x∈N*

deci x∈{0, 2, 4, 8, 20}=B

C

2x-5∈D29={1, 29}|+5

2x∈{6, 34}|:2

x∈{3, 19}=C