Question

B = 20182018 . 2019 - 20192019 . 2018 + 2019 - 2018. Tính B

Answer 1

\(B=20182018\cdot2019-20192019\cdot2018+2019-2018\\ B=10001\cdot2018\cdot2019-10001\cdot2019\cdot2018+2019-2018\\ B=2019-2018=1\)

Answer 2

B = 20182018 . 2019 - 20192019 . 2018 + 2019 - 2018.

20182018 = 20180000 + 2018

= 2018 . 10000 + 2018 . 1

= 2018 . (10000 + 1)

= 2018 . 10001

20192019 = 20190000 + 2019

= 2019 . 10000 + 2019 . 1

= 2019 . (10000 + 1)

= 2019 . 10001

B = 20182018 . 2019 - 20192019 . 2018 + 2019 - 2018

B = (2018 . 10001 . 2019 - 2019 . 10001 . 2018) + (2019 - 2018)

B = 0 + 1

B = 1

Answer 3

B=20182018⋅2019−20192019⋅2018+2019−2018B=10001⋅2018⋅2019−10001⋅2019⋅2018+2019−2018B=2019−2018=1