Question

ab=?
ab=4×(a+b)
urgent​

Answer 1

Răspuns:

(a,b)∈{(1,2),(2,4),(3,6),(4,8)}

Explicație pas cu pas:

10a+b=4·(a+b), unde a,b∈{0,1,2,...,9}

10a+b=4a+4b

10a-4a=4b-b

6a=3b, |:3

2a=b

Variante de raspuns: (a,b)∈{(1,2),(2,4),(3,6),(4,8)}