Question

Aflati nr
$abcd$
in scrierea in baza 10 stiind ca
$ab \times ba = dcba$

​

Answer 1

Răspuns:

Explicație pas cu pas:

abcd in baza 10:1000a+100b+10c+d

(10a+b)(10b+a)=100ab+10a+10b+ab=101ab+10(a+b)

dcba=1000d+100c+10b+a=100ab+10a+10b+ab

a=ab   ⇒b=1

b=a+b   ⇒a=0

d=0

c=ab=0           abcd=100