Question

(x-3).(y-4)=7.tìm x; y nguyên

Answer 1

(x-3).(y-4)=7

=> 

x-3	7	1	-7	-1
y-4	1	7	-1	-7

=> 

x	10	4	-4	2
y	5	11	3	-3

 

Answer 2

(x-3).(y-4)=7 => x-3;y-4 thuooc U(7)={-1;;-7;1;7}

x-3	-1	1	-7	7
y-4	-7	7	-1	1
x	2	4	-4	10
y	-3	11	0	5

vay cac cap (x;y) la (2;-3);(4;11);(-4;0);(10;5)