= 5(1/1.2+1/2.3+1/3.4+...+1/9.10)

=5(1-1/2+1/2-1/3+1/3-1/4+...+1/9-1/10)

=5(1-1/10)

=5.9/10

=9/2

tick for me

they are Sơn and you

Their parent are teacher

In their family has five people

oh

Ok! Say for the beauty of gold, we all know gold is precious and expensive. In addition to the properties, they have many other properties as: twinkle,beautiful,giving people a nobility and ect....

That 's all. So easy !!! Remember tick for me ♥♥♥

van toc tau thuy la

( 28,4 + 18,6 ) : 2 = 23,5 (km/gio)

van toc dong nuoc la

28,4 - 23,5 = 4,9 (km/gio)

nho **** nhe thank you so much

động từ bất quy tắc V3 

do

write

see

be

drink

do

have

wear 

take

say

cut

been                   draw ( mk ko bít cái này nha )

bought                 drunk

chose                   came

cut                           done

Nếu đúng thì tick cho mk nha thanks nhìu

Hà Giang yêu bạn nhiều nha