Rßng räc
m
k
m
k
k
m
k
m
K
1
K
2
m
1
k
m
2
m
K
2
K
1
m
K
1
K
2
GhÐp lß xo
Bµi To¸n va ch¹m
m

m
k
M
m
h
m
h
M
m
k
k
m
0
m
v
m
0
M
k
m
M
h
m
k
k
D
m
0
v
m

D
m
k
k
2
k
1
m
Dông cô VÏ h×nh
K
1
m
m
K
2
K
1
m
K
2
K
1
x
m
K
2
K
1
(HV.1) (HV.2)(HV.3)