cho các số dương X,Y,Z thỏa mãn :x\(^3\)+Y\(^3\)+Z\(^3\)=1

chứng minh rằng; \(\dfrac{X^2}{\sqrt{1-X^2}}\)+\(\dfrac{Y^2}{\sqrt{1-Y^2}}\)+\(\dfrac{Z^2}{\sqrt{1-Z^2}}\)\(\ge\)2 

2.He is very interested ..........................the history of VN

3.how ....................going to Ben Thanh market this afternoon?

4.that's suit is good .................... you to help me with this math problem 

5.my father is good .........................gardening

6.this suit is different ..........................the one I saw yesterday

7my son usually comes home .......................weedkend

8.they have organized a community meeting in order .....................discuss the situation

1. can I help you ......................your bags , miss lien?

6.trung used (write)..........................................to his friends when he was 16 years old

7.the festivals in VN usually (occus).................. in the beginning of the years

8.where .................you (speak)............................. your summer holiday holiday last year ,hoa?

9.are you busy this evening ?

    - yes ,I(meet).......................................tuan at the library at seven

10.excuse me !......................you (speak) enghlish? -yes,Iam