a) 2008 + 2008 + 2008 + 2008 - 2008 x 4

= (2008 x 4) - (2008 x 4)

= 0

b) 88 - 8 + 8 + 8 + ... + 8

= 88 - 8 x 11

= 88 - 88

= 0

A và B đều bằng o nha bn

Hok tốt

\(A=\frac{2002}{2001}+\frac{2003}{2002}+\frac{2004}{2003}+\frac{2005}{2004}+\frac{2006}{2005}+\frac{2007}{2006}+\frac{2008}{2007}+\frac{2009}{2008}>\frac{2001}{2001}+\frac{2002}{2002}+\frac{2003}{2003}+\frac{2004}{2004}+\frac{2005}{2005}+\frac{2006}{2006}+\frac{2007}{2007}+\frac{2008}{2008}\)

\(A=\frac{2002}{2001}+\frac{2003}{2002}+\frac{2004}{2003}+\frac{2005}{2004}+\frac{2006}{2005}+\frac{2007}{2006}+\frac{2008}{2007}+\frac{2009}{2008}>1+1+1+1+1+1+1+1\)\(A=\frac{2002}{2001}+\frac{2003}{2002}+\frac{2004}{2003}+\frac{2005}{2004}+\frac{2006}{2005}+\frac{2007}{2006}+\frac{2008}{2007}+\frac{2009}{2008}>8\)

\(A>8\)

Viết thương của mỗi phép chia sau dưới dạng phân số:

a) 7 : 9.\(=\dfrac{7}{9}\).................

b. 8:11 .....\(=\dfrac{8}{11}\).............

c. 2001 : 2008.....\(=\dfrac{2001}{2008}\).............

d. a : 7 ....\(=\dfrac{a}{7}\)..............

a)7/9
b)8/11
c)2001/2008
d)a/7
e)b/a +c=b/a+ac/a=b+ac/a
f)c/(a+b)

Trả lời :

B. 2009

đúng ròi

 8 x 427 x 3 + 6 x 573 x 4

= 8 x 3 x 427 + 6 x 4 x 573

= 24 x 427 + 24 x 573

= 24 x (427 + 573)

= 24 x 1000

= 24000

 2008 x 867 + 2009 x 133

= 2008 x 867 + 2008 x 133 + 133

= 2008 x (867 + 133) + 133

= 2008 x 1000 + 133

= 2008133

tick cho mink nhé

a. ( 4 x 25 ) x (5 x 9)

= 100 x 45

= 4500

b. (2008 x4) - ( 2008 x 4)

= 0

2 + 5 + 7 + 8 + 5 + 3 = 30

80 : 10  x ( 2 + 5 ) = 56

85 + 5 - 8 = 82

25 + 9 + 2008 = 2042

1 + 7 + 2013 = 2021

7 + 11 + 1984 = 2002