x2 + xy + x + y = 2
x . x + x . y + x + y = 2
x . ( x + y ) + x + y = 2
x . ( x + y ) + ( x + y ) . 1 = 2
( x + y ) . ( x + 1 ) = 2
=> x + 1 thuoc U(2)
=> x + 1 thuoc { 1 ; 2 }
Lap bang :
x + 1 | 1 | 2 |
x + y | 2 | 1 |
x | 0 | 1 |
y | 2 | 1 |
Vay ( x ; y ) la : ( 0 ; 2 ) ; ( 1 ; 1 )
P/s tham khao nha
Mk thieu mot buoc va gio mk lam tiep nha.
Lam tiep
Ta co : neu x = 1, y = 1 thi
12 + 1 . 1 + 1 + 1 = 2
1 +1 + 1 + 1 = 2
Ma 1 + 1 + 1 + 1 = 4 => x = 1; y = 1 ( loai )
Vay x =0; y = 2
P/s tham khao nha
giúp mình với
tìm STN n,sao cho n+4 chia hết cho n+1