Ta có:\(A=2004\times15+2004\times6-2004\)

\(=2004\times\left(15+6-1\right)\)

\(=2004\times\left(21-1\right)=2004\times20\)

\(< 20\times2005=B\)

Nên \(A< B\)

A lớn hơn

A>B nha bạn

\(A=77\times73\)

\(B=71\times79\)

\(\Rightarrow A< B\)

\(\approx\)Hok tot \(\approx\)

2008 x 2008 > 2007 x 2009

2008 x 2008 lớn hơn 2007 x 2009 1 đơn vị

2007 x 2009 

= ( 2008 - 1 ) x ( 2008 + 1 )

= ( 2008 ) ²  - 1²

Ta thấy 2008 x 2008 = 2008² 

=> 2008 x 2008 > 2007 x 2009 

9998 x 9997 + 9997 + 9997 = 99970000

đáp số

=99970000

học tốt ♥

x + 4,72 = 9,18

x = 9,18 - 4,72 

x= 4,46

x - 2/3 = 1/2

x = 1/2 + 2/3

x = 7/6

4/7 + x = 2 

x = 2 - 4/7 

x = 10/7

9,5 - x = 2,7

x = 9,5 - 2,7

x = 6,8

Bài 3:

P=a+a+a+a+a+a+1010+b+b+b+b+b+b-2018

=6a+6b-1008

=6(a+b)-1008

\(=6\times468-1008=1800\)

Bài 2: \(A=\overline{1a26}+\overline{4b4}+\overline{57c}\)

=1000+100a+20+6+400+10b+4+570+c

=100a+10b+c+2000

\(B=\overline{ab9}+\overline{199c}\)

=100a+10b+9+1990+c

=100a+10b+c+1999<100a+10b+c+2000=A

=>A>B

Bài 1:

\(\left(a+1970+y\right)\times2-11=2023+2\times\left(1003+a\right)\)

=>\(2\times\left(a+1970+y\right)=2034+2\times\left(1003+a\right)\)

=>a+1970+y=1014+1003+a

=>y+1970=2017

=>y=2017-1970

=>y=47

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