Question

2×5^2-5×(3^2+5-3 (2y-2004^0))=5^2

Answer 1

2 x 5² - 5 x [ 3² + 5 - 3 x ( 2 y - 2004⁰ ) ] = 5²

2 x 25 - 5 x [ 9 + 5 - 3 x ( 2 y - 1 ) ] = 25

5 x [ 14 - 3 x ( 2 y - 1 ) ] = 50 - 25

5 x [ 14 - 3 x ( 2 y - 1 ) ] = 25

14 - 3 x ( 2 y - 1 ) = 25 : 5

3 x ( 2 y - 1 ) = 14 - 5 = 9

2 y - 1 = 9 : 3

2 y - 1 = 3

2 y = 3 + 1

y = 4 : 2

y = 2 → numarul necunoscut