theo mk là

A thì = tất cả các phân số có tử bé hơn mẫu lên cho là bé hơn 1

B = 3

vậy B > A

Tính làm sao cũng được 

tùy theo cách tính ( tự tìm A)

theo tui tính 

A=3

B=3

=> A=B

A=1/2 + 1/3 + 1/4 + ... + 1/15 + 1/16 = (1/2 + 1/3 + 1/4 + 1/5) + (1/6 + 1/7 + 1/8) + (1/9 + 1/10 + 1/11) + (1/12 + 1/13 + 1/14) + (1/15 + 1/16)

Vì 1/6 + 1/7 + 1/8 < 3x 1/6 = 1/2

   1/9 + 1/10 + 1/11 <3x1/9 = 1/3

   1/12 + 1/13 +1/14 < 3x1/12 = 1/4

   1/15 + 1/16 < 3 x 1/15 = 1/5

Nên A < 2 x (1/2 + 1/3 + 1/4 + 1/5) < 2 x (1/2 + 1/2 + 1/4 + 1/4) =3 

B=3

=> A=B

tui giải chi tít hơn rùi đó

that is a 10-year-old girl.

he is a careful driver

how much is a hat?
my house is not far from my school.

Phuong is the tallest in my class

i have a dozen of eggs.

that is a 10-year-old girl.

he is a careful driver

how much is a hat?
my house is not far from my school.

Phuong is the tallest in my class

i have a dozen of eggs.

that is a 10-year-old girl.

he is a careful driver

how much is a hat?
my house is not far from my school.

Phuong is the tallest in my class

i have a dozen of eggs.

3/10 + 4/12 + 2/10 + 2/12

= ( 3/10 + 2/10 ) + ( 4/12 + 2/12) 

= 5/10 + 6/12

= 1/2 + 1/2 

= 2/2 = 1 

10/15 -7/5 * 10/15 - 5/5

= 10/15 * ( 7/5 -5/5)

= 2/3 * 2/5 

= 4/15 

Cbht!!!

3/10+4/12+2/10+2/12

=(3/10+2/10)+(4/12+2/12)

=1/2+1/2

=1

mik biết ............................................................................ là ..................................................................................................................................................................mik ................................................................................chết........................................liền

là ngày gì vậy