\(xy+3x-2y=11\)

\(\Leftrightarrow x\left(y+3\right)-2\left(y+3\right)=5\)

\(\Leftrightarrow\left(x-2\right)\left(y+3\right)=5\)

\(\Leftrightarrow\left(x-2\right)\) và \(\left(y+3\right)\) là các ước nguyên của 5

TH1 : \(x-2=1\Leftrightarrow x=3\)

          \(y+3=5\Leftrightarrow y=2\)

TH2 : \(x-2=-1\Leftrightarrow x=1\)

          \(y+3=-5\Leftrightarrow y=-8\)

TH3 :  \(x-2=5\Leftrightarrow x=7\)

           \(y+3=1\Leftrightarrow y=2\)

TH4  : \(x-2=-5\Leftrightarrow x=-3\)

           \(y+3=-1\Leftrightarrow y=-4\)

Vậy \(\left(x;y\right)=\left(3;2\right)\left(1;-8\right)\left(7;-2\right)\left(-3;-4\right)\)

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http://olm.vn/hoi-dap/question/87580.html

xy + 3x-2y=11 
<=> x(y+3)-2(y+3)=5 
<=>(x-2)(y+3)=5 
suy ra (x-2) và (y+3) là các ước nguyên của 5. 
Th1. x-2=1 <=>x=3 
.......y+3=5 <=> y=2 
Th2 x-2=-1 <=> x=1 
.......y+3=-5 <=> y= -8 
Th3. x-2=5 <=> x=7 
.......y+3=1 <=> y= -2 
Th4. x-2= -5 <=> x= -3 
.......y+3= -1 <=> y= -4 

Vậy (x,y) = (3, 2); (1, -8); (7, -2); (-3, -4)

gợi ý nhé:

- How often do u watch ?

- What channels do u often watch?

- Do u often eat snacks while watching TV?

I enjoy watching TV. I often spend four hours a day to watch TV. I often watch TV when I have free time for entertaining or sometimes when I am eating. I usually watch cartoons or some game shows. I often turn off the TV when I am not watching it. I think I have good watching habits. I never forget to prepare my lessons or do my homework before watching TV

  Hok tốt

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chịu thua

Sai rồi kết quả = 0 mà !

=79888028004

k mih nha

19991999.1998-19981998.1999

=79888028004

k mih nha

\(Xx9-1,5=30\)

\(Xx9=30+1,5\)

\(Xx9=31,5\)

\(X=31,5:9\)

\(X=3,5\)

X.9=30+1,5

X.9=31,5

X=31,5:9

X=3,5

cảm ơn các bn nhé !!! I love you all !!! moahhhhhh