Question

a) (x+2).(y-3)=5

b) (x+3).(y-5)= -25

c) (x-4).(y+1)=27

Answer 1

a) 

x+2	-5	-1	1	5
y-3	-1	-5	5	1
x	-7	-3	-1	3
y	2	-2	8	4

=> (x;y) = (-7;2);(-3;-2);(-1;8);(3;4) thỏa mãn (x+2)(y-3) = 5

b) 

x+3	-25	-5	-1	1	5	25
y-5	1	5	25	-25	-5	-1
x	-28	-8	-4	-2	2	22
y	6	10	30	-20	0	4

=> (x;y) = (-28;6);(-8;10);(-4;30);(-2;-20);(2;0);(22;4) thỏa mãn (x+3)(y-5) = -25

c) 

x-4	-27	-9	-3	-1	1	3	9	27
y+1	-1	-3	-9	-27	27	9	3	1
x	-23	-5	1	3	5	7	13	31
y	-2	-4	-10	-28	26	8	2	0

=> (x;y) = (-23;-2);(-5;-4);(1;-10);(3;-28);(5;26);(7;8);(13;2);(31;0) thỏa mãn (x-4)(y+1) = 27