E-mail is an                      correspondence system

1. Chứng minh |x-y|<|1-xy| với |x|<1,|y|<1

2. a) Tìm GTNN của biểu thức A=x^2-2x+1975/x^2

     b) Cho x,y>0, x+y=1. Chứng minh: 2(x^4+y^4)+1/2xy>=2.1/4

Write a paraghrap (120-150 words) about the following topic

"Water is important for all living things. Do you agree or disagree? Give your reasons "

Write a composition about the advantages and disadvantages of social network. Give your point of view (150-200 words)

ai bt đáp án đề thi anh lớp 8 của phòng giáo dục huyện thường tín năm 2013-2014 ko ạ??

help với

Use the given words or phrases to write the story. 

Last night/ I/ terrible nightmare.// I / walking through/ deep forest/ and suddenly/ see/ cave.// Cave/ anormous.

As I/ walk deeper/ into/ cave/ suddenly/ hear/ ascream.// It/ huge bear.

I/ run/ out of/ cave/ as fast as/ I could/ but/ couldn't.// The bear/ start/ shake me.

Just then/ wake up and find/ it/ my brother,/ not/ bear.

Viết bài văn bằng tiếng anh : If i have a travel , i will choose ... 

Nhanh nhanh mình tick nhaaa

Viet bai luan van bang tieng anh

How do you think about "authentic pho"? Do you think is it seems to be right when a foreiner cooks a vietnamese dish?

give your opinion below

bai nao hay mk cho 3 tick

Khử 3,2g FexOy = 1,334(lit) H2 đktc. Tìm CTHH FexOy