Aˆ = A(A = 90 )0 2 A = 2 A A+) )= .+ += 0= 01S U T M
2 .
a
ˆ =
a
(a
= 90 )
0
2
a
= 2
a a
+
)
)
=
.
+
+
= 0
= 0
1
S u t m: OÀN TI N TRUNG - THCS Hoàng V n Th - N
2
1 -
+ 2
+ +
1 -
2010
2
+ 1
2
2(2 + 3
=
= ( 3 +1)
2
= 3 +1
2 + 3
1
2 + 2 3
2 3 - 2
2
+1
=
4 - 3
2 3
2
= +1
= 1
1
9
+ -
= 0
+ 2 - 9 = 0
2
2
= - 1 - 10
1
= - 1 + 10
2
= 0
- 8 + 2 = 0
=
1
4
1
2
+ 4 - 1 0
- 4 - 3 2
- 4 + 3 2
+
= 0
1
1
+
=
+
(
+
)(
- 1) = 0
1
2
- 1 = 0
1
2
1
2
1
2
1
2
1
2
2 = 0
= 0
= - 4 - 19
+ 8 - 3 = 0
= - 4 + 19
1
a
A
=
.
;
a
a
1
a
2
2
b
=
.
;
a
=
1
a
;
2
C
B
c
=
+
I
a
=
a
a
2
( + )
2
a
2
=
a
2
( + )
=
+
2010
ˆ
ˆ
=
n ( )
) )
1
2
=
ˆ
=
ˆ
(=
ˆ
)
1
1
2
ˆ
= 45
0
ˆ
= 45
0
N
M
ˆ
= 45
0
=
ˆ
1
2
ˆ
=
ˆ
= 90
0
2
I
A
1
ˆ
+
ˆ
= 90 + 90 = 180
0
0
0
B
1
P
1 2 1
1
2
+
+
L =
.
=
2
2
2
Q
F
- - + + - - -
- -
= = =