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x(y+2)+(y+2) =15
(x+1)(y+2) =15
x+1 | 1 | 3 | 5 | |||
y+2 | 15 | 5 | 3 | |||
x | 0 | 2 | 4 | |||
y | 13 | 3 | 1 |
b,xy-x-y-4=0
xy-x-y=4
x(y-1)-y=4
x(y-1)-(y-1)=5
(y-1).(x-1)=5
Vì 5=1.5
5.1
-1.(-5)
-5.(-1)
nên thay vao BT rồi tính
a) \(xy+3x-2y-11=0\)
\(x\left(y+3\right)-2y-6-5=0\)
\(x\left(y+3\right)-2\left(y+3\right)=5\)
\(\left(x-2\right)\left(y+3\right)=5\)
\(x-2;y+3\in U\left(5\right)\)
x-2 | 1 | -1 | 5 | -5 |
y+3 | 5 | -5 | 1 | -1 |
x | 3 | 1 | 7 | -3 |
y | 2 | -8 | -2 | -4 |
b) \(xy+2x+y+11=0\)
\(x\left(y+2\right)+y+2+9=0\)
\(x\left(y+2\right)+\left(y+2\right)=-9\)
\(\left(x+1\right)\left(y+2\right)=-9\)
\(x+1;y+2\in U\left(-9\right)\)
x+1 | 1 | -1 | 3 | -3 | 9 | -9 |
y+2 | -9 | 9 | -3 | 3 | -1 | 1 |
x | 0 | -2 | 2 | -4 | 8 | -10 |
y | -11 | 7 | -5 | 1 | -3 | -1 |
a) $xy+3x-2y-11=0$$x\left(y+3\right)-2y-6-5=0$$x\left(y+3\right)-2\left(y+3\right)=5$$\left(x-2\right)\left(y+3\right)=5$$x-2;y+3\in U\left(5\right)$
b) $xy+2x+y+11=0$
$x\left(y+2\right)+y+2+9=0$$x\left(y+2\right)+\left(y+2\right)=-9$$\left(x+1\right)\left(y+2\right)=-9$$x+1;y+2\in U\left(-9\right)$
x-2 | 1 | -1 | 5 | -5 | ||
y+3 | 5 | -5 | 1 | -1 | ||
x | 3 | 1 | 7 | -3 | ||
y | 2 | -8 | -2 | -4 | ||
x+1 | 1 | -1 | 3 | -3 | 9 | -9 |
y+2 | -9 | 9 | -3 | 3 | -1 | 1 |
x | 0 | -2 | 2 | -4 | 8 | -10 |
y | -11 | 7 | -5 | 1 |
xy+2x+y-13=0
x(y+2)+y+2=15
x(y+2)+(y+2)=15
(x+1)(y+2)=15
=>
2x+xy+y=3