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

Toán Lớp 6: Tìm x,y thuộc Z: c) (x-4).(x-y+2)=7

Toán Lớp 6: Tìm x,y thuộc Z:
c) (x-4).(x-y+2)=7

Comments ( 1 )

  1. Answer
    (x-4).(x-y+2)=7
    =>x-4,x-y=2 ∈ Ư(7)={+-1;+-7}
    x-4=7=>x=7+4=11
    x-4=-7=>x=-7+4=-3
    $\text{Vì x ∈ {11;-3} => Ta có biểu thức sau :}$
    x-y+2=7=>11-y+2=7=>y=11-7-2=>y=2
    x-y+2=7=>-3-y+2=7=>y=-3-7-2=>y=-12
    $\text{Vậy x ∈ {11; -3} ; y ∈ {2; -12}}$
    $\text{Xin hay nhất ạ !}$

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

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