cho A=\(\sqrt{x+2\sqrt{x-1}}\)+\(\sqrt{x-2\sqrt{x-1}}\)

rút gọn khi 1<=x<=2

tìm giá trị của x để A=x-\(\sqrt{x-2019}\)đạt GTNN và tìm GTNN đó

Cho x,y,z>0 và xyz=1. cmr: x^2/(1+y) + y^2/(1+z) + z^2/(1+x) >= 3/2.?

just as I......my homewprk lát night ,my friend phoned me(do)

the ao dai.........in poems ,novels and songs by poets,writers and musician for centuries(mention)

to keep our school yard......we should stop litering (pollute)

hí mother í one which taught him the first lesson on kindless(sửa sai)

yesterday my father gave me a very interesting bôk

->the book which my father gave me yesterday......

although the weather rained heavily ,she still came to the meeting on time

->despite,.......lan still came to the meeting on time

'Why don't you meet your pen pal peter at the airport tomrrow,Nam'' Nam'father said to nam

->Nam'father suggest that.......... pen pal peter at the airport the day after

dóe yourr father never go to work by bus?

->yourr father never go to work by bus,................

today isn't sunday,so he has to go to school

he .....to school ì today were sunday