Question

tim x,y biet (x+1)(x-y)=5

Answer 1

Ta có :

Ư ( 5 ) = { + 1 ; + 5 }

TH1 :

x + 1 = - 1 => x = - 2

x - y = - 5 => y = 3

TH2 :

x + 1 = - 5 => x = - 6

x - y = - 1 => y = - 5

TH3 :

x + 1 = 1 => x = 0

x - y = 5 => y = - 5

TH4 :

x + 1 = 5 => x = 4

x - y = 1 => y = 3

Vậy ( x;y ) \(\in\) { ( - 2 ; 3 ) ; ( - 6 ; - 5 ) ; ( 0 ; - 5 ) ; ( 4 ; 3 ) }