Toán Lớp 6: Tìm x,y thuộc Z thoả mãn
x y + x – y =7
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Toán Lớp 6: Tìm x,y thuộc Z thoả mãn
x y + x – y =7
Comments ( 1 )
xy + x – y = 7
(x – 1).y + x = 7
(x – 1).y + x – 7 = 0
x – 1 = 0
x = 0 + 1
⇒ x = 1