Question

produsul a doua nr nat este 414.Marind unul dintre factori cu 10 ,produsul nr devine 644

Answer 1

a × b = 414

a × ( b + 10 ) = 644

a × b + 10 a = 644

414 + 10 a = 644

10 a = 644 - 414

10 a = 230

a = 230 : 10

a = 23

a x b = 414

23 x b= 414

b = 414 : 23

b = 18

Verific:

23 × 18 = 414

23 × ( 18 + 10 ) = 23 × 28 = 644

Raspuns:   18  si 23 → cele doua numere

Answer 2

axb=414, (a+10)xb=644, axb+10b=644, inlocuim axb,

414+10b=644, 10b=644-414=230, b=230:10=23, a=414:23=18