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1)\(\left(x+1\right).\left(y-2\right)=0\) \(\left(x,y\inℤ\right)\)
\(\Rightarrow\orbr{\begin{cases}x+1=0\\y-2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=-1\\y=2\end{cases}}\)
2)\(\left(x-5\right).\left(y-7\right)=1\)
x-5 | 1 | -1 |
y-7 | 1 | -1 |
x | 6 | 4 |
y | 8 | 6 |
3)\(\left(x+4\right).\left(y-2\right)=2\)
x+4 | 1 | 2 | -1 | -2 |
y-2 | 2 | 1 | -2 | -1 |
x | -3 | -2 | -5 | -6 |
y | 4 | 3 | 0 | 1 |
4)\(\left(x-4\right).\left(y+3\right)=-3\)
x-4 | 1 | -1 | 3 | -3 |
y+3 | -3 | 3 | -1 | 1 |
x | 5 | 3 | 7 | 1 |
y | -6 | 0 | -4 | -2 |
5)\(\left(x+3\right).\left(y-6\right)=-4\)
x+3 | -1 | 1 | -4 | 4 | 2 | -2 |
y-6 | 4 | -4 | 1 | -1 | -2 | 2 |
x | -4 | -2 | -7 | 1 | -1 | -5 |
y | 10 | 2 | 7 | 5 | 4 | 8 |
6)\(\left(x-8\right).\left(y+7\right)=5\)
x-8 | 1 | 5 | -1 | -5 |
y+7 | 5 | 1 | -5 | -1 |
x | 9 | 13 | 7 | 3 |
y | -2 | -6 | -12 | -8 |
7)\(\left(x+7\right).\left(y-3\right)=-6\)
x+7 | -1 | 1 | -6 | 6 | -2 | 2 | -3 | 3 |
y-3 | 6 | -6 | 1 | -1 | 3 | -3 | 2 | -2 |
x | -8 | -6 | -13 | -1 | -9 | -5 | -10 | -4 |
y | 9 | -3 | 4 | 2 | 6 | 0 | 5 | 1 |
8)\(\left(x-6\right).\left(y+2\right)=7\)
x-6 | 1 | 7 | -1 | -7 |
y+2 | 7 | 1 | -7 | -1 |
x | 7 | 13 | 5 | -1 |
y | 5 | -1 | -9 | -3 |
ok :)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 2 x y + 2/15 ) x 3 = 4/5
( 2 x y + 2/15 ) = 4/5 : 3
( 2 x y + 2/15 ) = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 :2
y = 1/15
(2 x y + 2/15) x 3 = 4/5
2 x y + 2/15) = 4/5 : 3
2 x y + 2/15 = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 : 2
y = 1/15
7/9 x (2 - 1/3 x y) = 14/15
(2 - 1/3 x y) = 14/15 : 7/9
(2 - 1/3 x y) = 6/5
2 - y = 6/5 x 1/3
2 - y = 2/5
y = 2/5 + 2
y = 12/5
4/21 + 5 x y - 8/7 = 1/3
4/21 + 5 x y = 1/3 + 8/7
4/21 + 5 x y = 31/21
5 x y = 31/21 - 4/21
5 x y = 9/7
y = 9/7 : 5
y = 9/35
7/12 x y - 3/12 x y = 5
y x (7/12 - 3/12) = 5
y x 1/3 = 5
y = 5 : 1/3
y = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1 : x+1=1 => x = 0 => pt trên =-1 loại
x+1 = 3 => x= 2 => 2y-1=3 => y=2
vậy x=2;y=2
câu 2 : 2x-1 = 1 > x = 1 ; y +4=7 => y=3
2x-1 = 7 => x=4 ; y +7 = 1 => y = -6 loại
vậy x=1, y=3 v
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{8}{9}\) : ( 2 - 3 \(\times\) y) = \(\dfrac{5}{3}\)
2 - 3 \(\times\) y = \(\dfrac{8}{9}\) : \(\dfrac{5}{3}\)
2 - 3 \(\times\) y = \(\dfrac{8}{15}\)
3 \(\times\) y = 2 - \(\dfrac{8}{15}\)
3 \(\times\) y = \(\dfrac{22}{15}\)
y = \(\dfrac{22}{15}\) : 3
y = \(\dfrac{22}{45}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(\left(x-1\right)\left(y+1\right)=5\)
\(\Leftrightarrow x-1;y+1\inƯ\left(5\right)=\left\{\pm1;\pm5\right\}\)
x - 1 | 1 | -1 | 5 | -5 |
y + 1 | 5 | -5 | 1 | -1 |
x | 2 | 0 | 6 | -4 |
y | 4 | -6 | 0 | -2 |
d, \(\left(3-x\right)\left(xy+5\right)=-1\)
\(\Leftrightarrow3-x;xy+5\inƯ\left(-1\right)=\left\{\pm1\right\}\)
3 - x | 1 | -1 |
xy + 5 | -1 | 1 |
x | 2 | 4 |
y | -3 | -1 |
f, \(\left(x-7\right)\left(y+2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-7=0\\y+2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=7\\y=-2\end{cases}}}\)
Bn làm nốt nhé !
a, \(\left(x-1\right)\left(y+1\right)=5\)
\(< =>\left(x-1\right)\left(y+1\right)=1.5=5.1=-1.\left(-5\right)=-5.\left(-1\right)\)
x-1 | 1 | 5 | -1 | -5 | |||
y+1 | 5 | 1 | -5 | -1 | |||
x | 2 | 6 | 0 | -4 | |||
y | 4 | 0 | -6 | -2 |
Vậy ta có các cặp số x,y thỏa mãn đk sau : ...
b, \(\left(x+2\right)\left(y-3\right)=-3\)
\(< =>\left(x+2\right)\left(y-3\right)=-1.3=-3.1\)
x+2 | -1 | -3 | |
y-3 | 3 | 1 | |
x | -3 | -5 | |
y | 6 | 4 |
Vậy ta có các cặp số x,y thỏa mãn đk sau : ...
c, \(\left(x+2\right)\left(y-1\right)=3\)
\(< =>\left(x+2\right)\left(y-1\right)=1.3=3.1=-1.\left(-3\right)=-3.\left(-1\right)\)
x+2 | 1 | 3 | -1 | -3 |
y-1 | 3 | 1 | -3 | -1 |
x | -1 | 1 | -3 | -5 |
y | 4 | 2 | -2 | 0 |
Vậy ta có các cặp số x,y thỏa mãn đk sau : ...
d,\(\left(3-x\right)\left(xy+5\right)=-1\)
\(< =>\left(3-x\right)\left(xy+5\right)=1.\left(-1\right)=-1.1\)
3-x | -1 | 1 | |
xy+5 | 1 | -1 | |
x | 4 | 2 | |
xy | -4 | -6 | |
y | -1 | -3 |
Vậy ta có các cặp số x,y thỏa mãn đk sau : ...
2 câu sau dễ tự làm
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x\left(y-3\right)=-12\)
\(\Rightarrow x\left(y-3\right)=1.\left(-12\right)=\left(-12\right).1=\left(-1\right).12=12.\left(-1\right)=2.\left(-6\right)=\left(-6\right).2=\left(-2\right).6=6.\left(-2\right)=3.\left(-4\right)=\left(-4\right).3=\left(-3\right).4=4.\left(-3\right)\)
Ta có bảng sau:
\(x\) | \(1\) | \(-12\) | \(-1\) | \(12\) | \(2\) | \(-6\) | \(-2\) | \(6\) | \(3\) | \(-4\) | \(-3\) | \(4\) |
\(y-3\) | \(-12\) | \(1\) | \(12\) | \(-1\) | \(-6\) | \(2\) | \(6\) | \(-2\) | \(-4\) | \(3\) | \(4\) | \(-3\) |
\(y\) | \(-9\) | \(4\) | \(15\) | \(2\) | \(-3\) | \(5\) | \(9\) | \(1\) | \(-1\) | \(6\) | \(7\) | \(0\) |
KL: Các cặp số (x; y)...
b) \(\left(x-3\right)\left(y-3\right)=9\)
\(\Rightarrow\left(x-3\right)\left(y-3\right)=1.9=9.1=\left(-1\right).\left(-9\right)=\left(-9\right).\left(-1\right)=3.3=\left(-3\right).\left(-3\right)\)
Ta có bảng sau:
\(x-3\) | \(1\) | \(9\) | \(-1\) | \(-9\) | \(3\) | \(-3\) |
\(y-3\) | \(9\) | \(1\) | \(-9\) | \(-1\) | \(3\) | \(-3\) |
\(x\) | \(4\) | \(12\) | \(2\) | \(-6\) | \(6\) | \(0\) |
\(y\) | \(12\) | \(4\) | \(-6\) | \(2\) | \(6\) | \(0\) |
KL: Các cặp số (x; y)...
c) \(\left(x-1\right)\left(y+2\right)=7\)
\(\Rightarrow\left(x-1\right)\left(y+2\right)=1.7=7.1=\left(-1\right).\left(-7\right)=\left(-7\right).\left(-1\right)\)
Ta có bảng sau:
\(x-1\) | \(1\) | \(7\) | \(-1\) | \(-7\) |
\(y+2\) | \(7\) | \(1\) | \(-7\) | \(-1\) |
\(x\) | \(2\) | \(8\) | \(0\) | \(-6\) |
\(y\) | \(5\) | \(-1\) | \(-9\) | \(-3\) |
KL: Các cặp số (x; y)...
d) \(\left(x-3\right)\left(2y-1\right)=7\)
\(\Rightarrow\left(x-3\right)\left(2y-1\right)=1.7=7.1=\left(-1\right).\left(-7\right)=\left(-7\right).\left(-1\right)\)
Ta có bảng sau:
\(x-3\) | \(1\) | \(7\) | \(-1\) | \(-7\) |
\(2y-1\) | \(7\) | \(1\) | \(-7\) | \(-1\) |
\(x\) | \(4\) | \(10\) | \(2\) | \(-4\) |
\(y\) | \(4\) | \(1\) | \(-3\) | \(0\) |
KL: Các cặp số (x; y)...
e) \(\left(2x+1\right)\left(3y-2\right)=-55\)
\(\Rightarrow\left(2x+1\right)\left(3y-2\right)=1.\left(-55\right)=\left(-55\right).1=\left(-1\right).55=55.\left(-1\right)=11.\left(-5\right)=\left(-5\right).11=\left(-11\right).5=5.\left(-11\right)\)
Ta có bảng sau:
\(2x+1\) | \(1\) | \(-55\) | \(-1\) | \(55\) | \(11\) | \(-5\) | \(-11\) | \(5\) |
\(3y-2\) | \(-55\) | \(1\) | \(55\) | \(-1\) | \(-5\) | \(11\) | \(5\) | \(-11\) |
\(x\) | \(1\) | \(-28\) | \(-1\) | \(27\) | \(5\) | \(-3\) | \(-6\) | \(2\) |
\(y\) | \(-\dfrac{53}{3}\) | \(1\) | \(19\) | \(\dfrac{1}{3}\) | \(-1\) | \(\dfrac{13}{3}\) | \(\dfrac{7}{3}\) | \(-3\) |
KL: Các cặp số (x; y)...
(Do đề bài ko yêu cầu \(x;y\in N\) hay \(x;y\in Z\) nên các giá trị là phân số đều thỏa mãn nhé!)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x-1\right)\left(y-5\right)=7\)
\(\left(x-1\right)\left(y-5\right)=7=1.7=7.1=-1.\left(-7\right)=-7.\left(-1\right)\)
x-1 | 1 | 7 | -1 | -7 |
y-5 | 7 | 1 | -7 | -1 |
x | 2 | 8 | 0 | -6 |
y | 12 | 6 | -2 | 4 |
vậy ...
mấy cái khác tương tự nha
\(\left(x+3\right)\left(xy+2\right)=3\)
\(\left(x+3\right)\left(xy+2\right)=3=1.3=3.1=-1.\left(-3\right)=-3.\left(-1\right)\)
\(th1\orbr{\begin{cases}x+3=1\\xy+2=3\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-2\\-2y+2=3\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-2\\-2y=1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-2\\y=-\frac{1}{2}\end{cases}}}\)
\(th2\orbr{\begin{cases}x+3=3\\xy+2=1\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\0y+2=3\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=0\\0y=1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=0\\y=0:1\left(ktm\right)\end{cases}}}\)
\(th3\orbr{\begin{cases}x+3=-1\\xy+2=-3\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-4\\-4y+2=-3\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-4\\-4y=-5\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-4\\y=-\frac{5}{4}\end{cases}}}\)
\(th4\orbr{\begin{cases}x+3=-3\\xy+2=-1\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-6\\-6y+2=-1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-6\\-6y=-3\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-6\\y=-\frac{1}{2}\end{cases}}}\)
vậy .......
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