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Hãy luôn nhớ cảm ơn và vote 5*
nếu câu trả lời hữu ích nhé!
Đáp án + Giải thích các bước giải:
`3xy+2x-5y=6`
`=>9xy+6x-15y=18`
`=>3x(3y+2)-5(3y+2)=18-10`
`=>(3y+2)(3x-5)=8`
Ta có bảng sau:
\begin{array}{|c|c|c|}\hline \text{3x-5}&\text{1}&\text{2}&\text{4}&\text{8}&\text{-1}&\text{-2}&\text{-4}&\text{-8}\\\hline \text{3y+2}&\text{8}&\text{4}&\text{2}&\text{1}&\text{-8}&\text{-4}&\text{-2}&\text{-1}\\\hline \text{3x}&\text{6}&\text{7}&\text{9}&\text{13}&\text{4}&\text{3}&\text{1}&\text{-3}\\\hline \text{3y}&\text{6}&\text{2}&\text{0}&\text{-1}&\text{-10}&\text{-6}&\text{-4}&\text{-3}\\\hline \text{x}&\text{2}&\text{$\dfrac{7}{3}$}&\text{3}&\text{$\dfrac{13}{3}$}&\text{$\dfrac{4}{3}$}&\text{1}&\text{$\dfrac{1}{3}$}&\text{-1}\\\hline \text{y}&\text{2}&\text{$\dfrac{2}{3}$}&\text{0}&\text{$\dfrac{-1}{3}$}&\text{$\dfrac{-10}{3}$}&\text{-2}&\text{$\dfrac{-4}{3}$}&\text{-1}\\\hline\end{array}
Vì `x,y in Z`
`=>(x;y)={(2;2);(3;0);(1;-2);(-1;-1)}`
Hãy giúp mọi người biết câu trả lời này thế nào?
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