[(3a+5)×3+]×3+5=92

a=?


3a533592a class=

Răspuns :

[(3a+5)*3+5]*3=92-5
[(3a+5)*3+5]*3=87
(3a+5)*3+5=87:3
(3a+5)*3+5=29
(3a+5)*3=29-5
(3a+5)*3=24
(3a+5)=24:3
3a+5=8
3a=8-5
3a=3
a=3:3
a=1