Question

DADO 15XYA+25XA QUAL E O VALOR DA EXPRESSAO, SE X=10 ; Y=5 E A=3

Answer 1

Basta vc substituir as letras pelos valores correspondentes
(15•10•5•3 )+ (25•10•3)=
2250+750=
3000

Answer 2

( 15 . x . y . a ) + ( 25 . x . a )
( 15 . 10 . 5 . 3) + ( 25 . 10 . 3 )
2.250 + 750

Resposta: 3000