Toán Lớp 7: a) Tìm x, y nguyên biết 1x=1/6+3/y
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Toán Lớp 7: a) Tìm x, y nguyên biết 1x=1/6+3/y
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=> 1/x – 3/y = 1/6
=> (y-3x)/xy = 1/6
=> 6.(y-3x) = xy
=> 6y-18x – xy = 0
=> 6y- x.(18+y) = 0
=> 6y + 108 – x.(18+y) – 108 = 0
<=> (y+18).(6-x) = 108