-axit HCL, H2SO4

-Cl2, H2SO4 đ , HNO3

- O2

khi phảng ứng với axit và khi tác dụng với những muối clorua của các kim loại đứng sau sắt

47 C 

48 KO NHỚ 

Câu 5: B

Chỉ có bài ở giữa là tự luận nên mình không tách :> Mất công lắm

I arrived in Hanoi and stayed with him last week
I was worried that you wouldn't come back
entertainment
wonderful
celebration

I arrived in Hanoi and stayed with him last week
I was worried that you wouldn't come back
entertainment
wonderful
celebration

B - C - C - D
C - B - B - D - A - D - C - C - B - C

B -> COULD
B -> WAS
D -> SEEING
C -> X
I enjoyed the peaceful atmosphere in Hanoi
It takes us 2 hours to get there
tropical
natural
majority
Lunar New Year
Tet usually begins in late January or early February

1: Xét ΔABC vuông tại A có 

\(\widehat{B}+\widehat{C}=90^0\)

hay \(\widehat{C}=30^0\)

Xét ΔABC vuông tại A có 

\(BC=\dfrac{AC}{\sin60^0}\)

\(=\dfrac{32\sqrt{3}}{3}\left(cm\right)\)

hay \(AB=\dfrac{16\sqrt{3}}{3}\left(cm\right)\)