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

Toán Lớp 7: tìm x,y thuộc Z : để xy-3x+2y=10

Toán Lớp 7: tìm x,y thuộc Z : để xy-3x+2y=10

Comments ( 2 )

  1. $\text{ xy – 3x + 2y= 10}$
    ⇒ $\text{xy – 3x + 2y – 6 = 4}$ 
    ⇒ $\text{x.( y – 3) + 2. ( y – 3) = 4}$
    ⇒ $\text{( y – 3 ) . ( x + 2 ) = 4}$
    ⇒ $\text{y – 3 ; x + 2 ∈ Ư (4)}$
    $\text{Ư (4) = ± 1 ; ± 2 ; ± 4 }$
    $\text{Vậy …..}$

    toan-lop-7-tim-y-thuoc-z-de-y-3-2y-10

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