26
9
a, ( x + 1 ) ( y - 5 ) = 6 b, ( 2x + 1 ) ( 2y-1 ) = 15
cứu pé mấy chế ơi
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nếu câu trả lời hữu ích nhé!
2560
1626
`a,(x+1)(y-5)=6`
Vì `x,y in ZZ`
`=>x+1;y+1 in Ư(6)={+-1;+-2;+-3;+-6}`
Ta có bảng sau:
\begin{array}{|c|c|c|c|c|c|c|c|c|}\hline \text{$x+1$}&\text{1}&\text{$-1$}&\text{2}&\text{$-2$}&\text{3}&\text{$-3$}&\text{6}&\text{$-6$}\\\hline \text{$x$}&\text{0}&\text{$-2$}&\text{1}&\text{$-3$}&\text{2}&\text{$-4$}&\text{5}&\text{$-7$}\\\hline \text{$y-5$}&\text{6}&\text{$-6$}&\text{3}&\text{$-3$}&\text{2}&\text{$-2$}&\text{1}&\text{$-1$}\\\hline \text{$y$}&\text{11}&\text{$-1$}&\text{8}&\text{2}&\text{7}&\text{3}&\text{6}&\text{4}\\\hline\end{array}
Vậy `(x,y) in {(0;11);(-2;-1);(1;8);(-3;2);(2;7);(-4;3);(5;6);(-7;4)}`
`b,(2x+1)(2y+1)=15`
Vì `x,y in ZZ`
`=>2x+1;2y+1 in Ư(15)={+-1;+-3;+-5;+-15}`
Ta có bảng sau:
\begin{array}{|c|c|c|c|c|c|c|c|c|}\hline \text{$2x+1$}&\text{1}&\text{$-1$}&\text{3}&\text{$-3$}&\text{5}&\text{$-5$}&\text{15}&\text{$-15$}\\\hline \text{$2x$}&\text{0}&\text{$-2$}&\text{2}&\text{$-4$}&\text{4}&\text{$-6$}&\text{14}&\text{$-16$}\\\hline \text{$x$}&\text{0}&\text{$-1$}&\text{1}&\text{$-2$}&\text{2}&\text{$-3$}&\text{7}&\text{$-8$}\\\hline \text{$2y+1$}&\text{15}&\text{$-15$}&\text{5}&\text{$-5$}&\text{3}&\text{$-3$}&\text{1}&\text{$-1$}\\\hline \text{$2y$}&\text{14}&\text{$-16$}&\text{4}&\text{$-6$}&\text{2}&\text{$-4$}&\text{0}&\text{$-2$}\\\hline \text{$y$}&\text{7}&\text{$-8$}&\text{2}&\text{$-3$}&\text{1}&\text{$-2$}&\text{0}&\text{$-1$}\\\hline\end{array}
Vậy `(x,y) in {(0;7);(-1;-8);(1;2);(-2;-3);(2;1);(-3;-2);(7;0);(-8;-1)}`
Hãy giúp mọi người biết câu trả lời này thế nào?
1632
2036
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