TL

5/7<1

7/4>1

vậy 5/7<7/4 

nha

HT

5/7<7/4

5/7= 5x4/ 7x 4 = 20/28

7/4 = 7x 7/ 4x7 =49/28

Vì 20/28 < 49/28 nên 5/7 < 7/4

\(C=\dfrac{1\dfrac{1}{2}+0,6-\dfrac{3}{7}}{2,5+1-\dfrac{35}{49}}=\dfrac{\dfrac{3}{2}+\dfrac{3}{5}-\dfrac{3}{7}}{\dfrac{5}{2}+\dfrac{5}{5}-\dfrac{5}{7}}=\dfrac{3\left(\dfrac{1}{2}+\dfrac{1}{5}-\dfrac{1}{7}\right)}{5\left(\dfrac{1}{2}+\dfrac{1}{5}-\dfrac{1}{7}\right)}=\dfrac{3}{5}\)

3/5

A= 289,6 x 2,896 = 28,96 x 10 x 2,896 = 28,96 x 28,96 = B

kết quả : A > B

Ta có: 
7/12 = 4/12 + 3/12 = 1/3 + 1/4 = 20/60 + 20/80 

1/41 + 1/42 + 1/43 +...+ 1/79 + 1/80 = (1/41 + 1/42 + 1/43 + ...+ 1/60) + (1/61 + 1/62 +...+ 1/79 + 1/80) 

Do 1/41> 1/42 > 1/43 > ...>1/59 > 1/60 
=> (1/41 + 1/42 + 1/43 + ...+ 1/60) > 1/60 + ...+ 1/60 = 20/60 

và 1/61> 1/62> ... >1/79> 1/80 
=> (1/61 + 1/62 +...+ 1/79 + 1/80) > 1/80 + ...+ 1/80 = 20/80 

Vậy: 1/41 + 1/42 + 1/43 +...+ 1/79 + 1/80 > 20/60 + 20/80 = 7/12 

=> 1/41 + 1/42 + 1/43 +...+ 1/79 + 1/80 > 7/12

\(A>B\)

Cảm ơn các bạn nha!

làm bừa thui

=34546

=52643654

ko biet

Ta có:

A > B

Chắc chắn 100%

a=4020025

b=4020024

  nên A > B

Ta có : A = 2005^2 = 2005.2005 = 2005.(2004+1) = 2005.2004+2005

            B = 2004.2006 = 2004.(2005+1) = 2004.2005+2004

Vì 2005.2004 = 2004.2005 và 2005 > 2004

=> 2005^2 > 2004.2006 => A >B

Ví dụ như:  big(to) ,  small(nhỏ) ,  tall(cao) .

  happy(vui vẻ) ,  easy(dễ)  ...

khó

Nam is the tallest in my class.

HCM city is the most populated city in VN .

Madara is shorter than Mikey .

Your house is more expensive than my house .

His book is more beauty than my book .

Gaara is more handsome than Draken .

Fuji mount is more exciting than Ha Long bay .

Kimono is more expensive than Hanbok .

Comedy is funnier than action .

watch anime is the most exciting in the cinema .