Tim x,y nguyen thoa man : 2x^2-2xy=5x-y-19 Nho thay co va cac ban giai ho , e xin cam on ? neu co ban nao hoac thay co co nhieu kinh nghiem xin chi giAO them cho e vi e dang on thi vao lop 10 chuyen nen can nhieu kinh nghiem e cam on truoic