Bài 1 : Cho x, y,z thỏa mãn : x,y,z#0

-2xy + 6yz + 3xz+6

x+2y-3z=4

Tính x^2 + 4y^2 + 9z^2

bài 2 : Cho a,b,c #0 : abc=1 và 1/a +1/b +1/c = 1/ a+b+c
Tính M = ( a-1 ) (b-1) ( c-1)

Is there a phone ?

=> Lan asked me ...

I. Reported statements

1. I live here with my parents=> He said....

2.Our new house is beautiful => He said....

3. I want to be a teacher of English => He said...

4. I can't speak Chinese => She said...

5.My sister is now having a wonderful time in Nha Trang => He said...