Question

So sánh A và B mà không tính giá trị cụ thể

A = 2018.2018

B = 2017.2019

Answer 1

\(A>B\)

_Học tốt_

Answer 2

A=2018.(2017+1)=2017.2018+2018

B=2017.2019=2017.(2018+1)=2017.2018+2017

vì 2018>2017

=>A>B

Answer 3

\(A=2018.2018=\left(2017+1\right).2018\) \(=2017.2018+2018\)

\(B=2017.2019=2017.\left(2018+1\right)\) \(=2017.2018+2017\)

Vậy từ đó \(\Rightarrow A>B\)

Answer 4

Ta có : B = 2017.2019

               = (2018 - 1).(2018 + 1)

               = 2018.2018 + 2018 - 2018 - 1

               = 2018.2018 - 1 < 2018.2018 = A

=> B < A hay A > B

Answer 5

A = 2018.2018 = (2017 +1).2018 = 2017.2018 + 2018

B = 2017.2019 = 2017.(2018 + 1) = 2017.2018 + 2017

  Vì  2017 < 2018 nên A > B

Answer 6

A=2018.2018=2018.(2017+1)=2018.2017+2018

B=2017.2019=2017.(2018+1)=2018.2017+2017

vì 2018>2017

=>A>B

hok tốt :v.

Answer 7

Ta có : 2017.2019=(2018-1).(2018+1) hay =2019.2017=(2018+1).(2018-1)       =[2018.(2018-1)]+[1.(2018-1)]                 =(2018.2018-2018)+(1.2018-1)               =2018.2018-2018+2018-1                       =2018.2018-1<2018.2018. Vậy: B<A hay A>B. ~よくべんきょうする~