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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Tìm cặp số nguyên (x; y ) thỏa mãn ( 2x+1)(y-1) = -7

Toán Lớp 6: Tìm cặp số nguyên (x; y ) thỏa mãn ( 2x+1)(y-1) = -7

Comments ( 1 )

  1. (2 x + 1) (y – 1) = -7
    ⇒2 x y + y + 6 = 2 x
    ⇒(2 x + 1) y = 2 x – 6
    ⇒2 x y – 2 x + y + 6 = 0
    ⇒2 x y – 2 x + y – 1 = -7
    ⇒2 x + 1!=0, y = (2 (x – 3))/(2 x + 1)
    ⇒x = -4, y = 2
    ⇒x = -1, y = 8
    ⇒x = 0, y = -6
    ⇒x = 3, y = 0
     

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222-9+11+12:2*14+14 = ? ( )