Question

determinati nr. a din:
[(5xa+19)x7-2]:9=34
dau coroana

Answer 1

[(5xa+19)x7-2]:9=34

(5xa+19)x7-2=34×9

(5xa+19)x7-2=306

(5xa+19)x7=306+2

(5xa+19)x7=308

5xa+19=308:7

5xa+19=44

5xa=44-19

5xa=25

a=25:5

a=5

Answer 2

[(5a+19)×7-2]:9=34
(35a+133-2):9=34
(35a+131):9=34
35a+131:9=34
35a+14,5=34
35a=34-14,5
35a=19,5
a=19,5:35
a=0,55
cred nu sunt sigura