Question

[le sy tu]

Tim so nguyen x,biet:

x	-2	-9	3	0
y	7	-1	8	15
x-y

Answer 1

[le sy tu]

x	-2	-9	3	0
y	7	-1	8	15
x-y	-9	-10	-11	0

Answer 2

[công chúa xinh xắn]

x	-2	-9	3	0
y	7	-1	8	15
x-y	-9	-8	-5	-15