已知5x+2y=11a，4x-4y=6a，求xy=？'s Friends • Steam Ladder

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#		Steam ID	Country	Level	Games	Badges	Playtime (H)	Years
1		Arnoux的旅人赞歌 Arnoux的旅人赞歌		19		13		9
2		Hyakki-Poi Hyakki-Poi		15		11		10