Question

[lam nhat hung]

x	5	-18		-25
y	-7	10	-10
x.y			-180	-1000

Answer 1

[Vũ Như Mai]

x	5	-18	18	-25
y	-7	10	-10	40
x.y	-35	-180	-180	-1000

Answer 2

[Yamada Miko]

x	5	-18	18	-25
y	-7	10	-10	40
x.y	-35	-180	-180	-1000