Question

[tran thi thanh tam]

tim x y thuoc z biet (x+y).2=xy

Answer 1

[Nguyễn Hoàng Việt]

=>2 x+2y =xy

=>xy -2x-2y=0

=>x(y-2)-2(y-2)=4

=>(x-2)(y-2)=4

x-2	1	4	-1	-4	2	-2
y-2	4	1	-4	-1	2	-2
x	3	6	1	-2	4	0
y	6	3	2	1	4	0

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