Question

determinati toate nr naturale de forma abc stiind ca a=b+c=4

Answer 1

b+c=4 ⇒ b=0, c=4
b=1, c=3
b=2, c=2
b=3, c=1
b=4, c=0
a=4
nr abc sunt : 404,413,422,431,440

Answer 2

a=b+c=4
404
413
422
431
440