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

Toán Lớp 6: tìm x , y thuộc Z biết (x-7) (xy+1)=9

Tháng Sáu 23, 2022 Toán học 1 Comment 0 views

Toán Lớp 6: tìm x , y thuộc Z biết (x-7) (xy+1)=9

Comments ( 1 )

  1. dananhnhu2k4
    dananhnhu2k4
    23 Tháng Sáu, 2022 at 12:03 sáng
    Reply
    Bạn tham khảo
    (x-7) (xy+1)=9
    =>(x-7)(xy+1)=(-9).(-1)=(-3).3=1.9=3.3
    Ta có bẳng sau:
    \begin{array}{|c|c|c|}\hline \text{x-7}&\text{-9}&\text{-3}&\text{-1}&\text{1}&\text{3}&\text{9}\\\hline \text{xy+1}&\text{-1}&\text{-3}&\text{-9}&\text{9}&\text{3}&\text{1}\\\hline \text{x}&\text{-2}&\text{4}&\text{6}&\text{8}&\text{10}&\text{16}\\\hline \text{y}&\text{1}&\text{-1}&\text{10/6(L)}&\text{1}&\text{9/10(L)}&\text{15/16(L)}\\\hline\end{array}
    Vậy (x;y)={(-2;1),(4;-1),(8;1)}
     

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

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