,XK  X  K  X K . D). 2 42 4  

2 , - BAI TAP TRAC NGHIEM PHUONG TRINH LUONG GIAC (1)
BAI TAP TRAC NGHIEM PHUONG TRINH LUONG GIAC (1)

2 ,

,

x

k x

 

k x

k . D).

2

4

 