Question

20×10+5×(10+3×(345-17×a))+16×16=581
Va rog cine mă poate ajuta?
Urgent !!!!!!​

Answer 1

20×10+5×(10+3×(345-17×a))+16×16=581

200+5×(13×(345-17×a))+256=581

5×(13×(345-17×a))=581-256-200

13×(345-17×a)=125/5

345-17×a=25/13

17×a=4.485/13-25/13

17×a=4460/13

a=4460/13*1/17

a=4460/(13*17)

a=4460/221