Question

URGENT!!
Aflati toate nr. naturale de forma:
a.
b.
c.
d.
e.

Answer 1

a. 57x : 10
x = {0}
570 : 10

b. 57x : 5 , 10
x={0}
570 : 10
570 : 5

c. x1x : 2
x = {2,4,6,8}
212, 414 , 818 , 616 : 2 

d. x7y : 5
x={ 1,2,3,4,5,6,7,8,9 }
y= {0 , 5}
170,270,370,470,570,670,770,870.970, 175 , 275 , 375................... :5

e. xxx:2
x= {2,4,6,8}
222 , 444 , 666 , 888 : 2