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quangcuteo2001
2 năm trước
1) 2x=3y và x+y=10 2) 3x=5y và x+y=40 3) 4x=3y và x-y=11 4) -2x=5y và x+y=30 5) 3x=4y và 2x+3y=34 6) 4x=5y và 3x-2y=35
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