Question

34. Determină toate numerele de forma: a) bb + ba = 77; b) ab + ba = 88.​

Answer 1

Răspuns:

la punctul a este ab+ba

a) ab + ba = 77

10a+b+10b+a=77

11a+11b=77

11(a+b)=77

a+b=77:11=>a+b=7

ab = (1,6); (2,5); (3,4); (4,3); (5,2); (6,1)

b) ab + ba = 88

10a+b+10b+a=88

11a+11b=88

11(a+b)=88

a+b=88:11=>a+b=8

ab = (1,7); (2,6); (3,5); (4,4); (5,3); (6,2); (7,1)