Question

Gíup mình với :

     a) ( x + 17 ) . ( y - 3 ) =7

     b) ( x + 1 ) . ( xy - 1 ) = 3

     c) xy + 12 = x + y

     d) ( 2x - 1 ) . ( y + 4 ) = 11

 

Answer 1

x+17=(-7,-1,1,7)

y-3=(-1,-7,7,1)

=>

x=(-24,-18,-16,-10)

y=(2,-4,10,4)

(xy)+(-24,2);(-18,-4);(-16,10);(-10,4)

Answer 2

thanks

Answer 3

b) x+1=(-3,-1,1,3)=>(xy-1)=(-1,-3,3,1)=>xy=(0,-2,4,2) 

x=(-4,-2,0,-2)

y=(0,1,-1)=> loiaj x=0

DS:

(x,y)=(-4,0);(-2,1);,(-2,-1)

c) tý nũa ăn com đã

Answer 4

c)xy+12=x+y

x(y-1)+11=(y-1)

(y-1)(1-x)=11

1-x=(-11,-1,1,11)=> x=(12,2,0,-10)

y-1=(-1,-11,11,1)=> y=(0,-10,12,2)

(xy)=(12,0);(2,-10),;(0,12):,(-10,2)

d)

2x-1=(-11,-1,1,11)=> x=(-5,0,1,6)

y+4=(-1,-11,11,1)=> y=(-5,-15,7,-3)

(x,y)=(-5,-5),;(0,-1); (1,7); (6,-3)