2x 1 5 3y 2 7 2x 3y 1 6x July 8, 2019 16 32 64 128 Cho 2x 1 5 3y 2 7 2x 3y 1 6x Tìm xy biết 2x 1 5 3y 2 7 2x 3y 1 6x 2x 1 5 y 2 7 2x 3y 1 6x
