Y= 2 x 4 x 6 x 8 x ... x 2018 x 2020

2 câu trả lời

Y= 2 x 4 x 6 x 8 x ... x 2018 x 2020

Y= 2 x 1 x 2 x 2 x 2 x 3 x 2 x 4 x ... x 2 x 1009 x 2 x 1010

Y= 2^1010 x ( 1 x 2 x 3 x 4 x ... x 1009 x 1010)

ta có Y= 2 x 4 x 6 x 8 x ... x 2018 x 2020

Y= [2020-2] :2 .1=2004

⇒Y=2004