A,Cho S=1/2.3/4.5/6.7/8...99/100
chứng minh rằng S<0,01
b,cho A=1/2.3/4.5/6.7/8...79/80 Chứng minh rằng A<1/9

=21.(54+46)+(-2000)
=21.100+(-2000)
=2100+(-2000)
=100(chắc thế :)))) )

Rearrange the words and phrases to make meaningful sentences.

1. the food / friendlier, / here / are / The people / better than/ other places/ in / and / is /.

      FThe people

2. two things / my neighbourhood / However, / dislike / I / there are / about /.

      F.________________________________________________________________________

3. like / many things / about / neighbourhood / There are/ I / my/.

      F_________________________________________________________________________

4. in Ha Noi/ less delicious / The seafood / more expensive / is / that in Nha Trang/ and / than /.

      F_________________________________________________________________________

5. busy and crowded, / / and / The streets / quite polluted / are / is /the air.

      F ________________________________________________________________________