Question

Ex 25 va rog! Dau fundă!​

Answer 1

10a+b+10c+d=47

10(a+c)+(b+d)=47

b+d=47-10(a+c)

10b+a+10d+c=173

(a+c)+10(b+d)=173

a+c+10[47-10(a+c)]=173

a+c+470-100a-100c=173

297=99a+99c

a+c=3 => a=1 si c=2

b+d=47-30=17 => b=8 si d=9

____ ____

a <=> b=1si 8 => 18 c <=> d=2 si 9 => 29

deci numerele sunt => 18 si 29

Verific:18+29=47 => (corect)