Question

exercitiul 9 si 10 va rog

Answer 1

9)

a+b=631   => a=631-b

a:b=3 r 7  => a=3b+7

inlocuim in relatie:

3b+7+b=631

4b+7=631

4b=631-7

4b=624

b=624:4

b=156

a=156*3+7

a=468+7

a=475

verificare:

475+156=631

475:156=3 r 7

10)

f+b=30 elevi   => f=30-b

b-2=f:3           =>  f=(b+2)*3    => f=3b+6

inlocuim in reletie:

3b+6+b=30

4b=30+6

4b=36

b=36:4

b=9

a=(9-2)*3

a=7*3

a=21

verificare:

21+9=30

21:3=9-2

7=7