Toán Lớp 6: Tìm số nguyên x,y biết: (x-2).(y+1) = 5
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Toán Lớp 6: Tìm số nguyên x,y biết: (x-2).(y+1) = 5
Comments ( 1 )
(x – 2) (y + 1) = 5
⇒(x – 2) y = 7 – x
⇒x y + x – 2 y – 2 = 5
⇒x y + x – 2 y – 7 = 0
⇒x – 2!=0, y = (7 – x)/(x – 2)
⇒x = -3, y = -2
⇒x = 1, y = -6
⇒x = 3, y = 4
⇒x = 7, y = 0