1) NH_3 du + HCl → NH₄Cl

Xac dinh chat OXH, chat khu va can bang

1) Neu ve hinh chieu canh, hinh chieu bang, hinh chieu dung co kich thuoc chieu dai la 10cm, chieu rong la 5cm, chieu cao la 2cm thi ve vat the voi kich thuoc chieu dai la 10cm, chieu rong la 5cm, chieu cao la 2cm giong nhu hinh chieu thi dung ti le 1:1 hay 1:2

1) Viet qua trinh cho e va nhan e, can bang phan ung sau:

a) Al + HNO₂ → Al(NO₃)₃ + N₂O + H₂O

1) Dung: more equipped with many modern electric  devices duoc khong

1) Tinh do dai doan AO

1) Goc C₁ va C₂ la goc gi

1) Tong so do 2 goc bet bang bao nhieu do

1) Tram trau tram co

    Trau dung an nam

    Trau nam an ba

    Lu khu trau gia

    Ba con mot bo

    Hoi so trau dung, trau nam, trau gia?

    Goi so trau dung, trau nam,trau gia lan luot la x,y,z

     Hay xac dinh kieu cua cac bien x,y,z (bien nguyen, bien thuc hay bien ki tu). Giai thich

1) Gia tri nho nhat cua ham so: f(x) = 3 - \(\dfrac{1}{5}\)sin²x.cos²x 

A. \(\dfrac{59}{20}\)                B. \(\dfrac{14}{5}\)             C. 3           D. \(\dfrac{29}{10}\)