S = 1
2
+ 2
2
+ ······ + n
2
= n (n + 1)(2n + 1)
1
6
S
=
KRcos
2
+ C cos
α
α
h
=
KRsin2 + C sin
1
2
α
S = (a + b) h (a, b, h > 0)
1
2
119
120
( )
0
< < 90˚
K,R, C > 0
α
121
122
λ
=
R
σ
E
(E, ,R> 0)
σ
123
S
=
bc sin A
1
2
(0˚ < A < 180˚)
124
Y
X
(X
1
, Y
1
)
(X
2
, Y
2
)
(X
3
, Y
3
)
S
=
2
(X
1
– X
2
)
(Y
3
– Y
1
)
+
(X
1
– X
3
)
(Y
1
– Y
2
)
125
y = a < x < b
b – a
1
y = 0 x < a , x < b
126
F = G
Mm
(M, m, r > 0)
127
[(X
A
, Y
A
) to (X
C
, Y
C
) → (x, y), R]
R
(X
A
, Y
A
)
(X
B
, Y
B
)
(X
C
, Y
C
)
(x, y)
x =
m +
m
1
mX
A
+ X
C
– Y
A
+ Y
C
m
1
y = Y
A
+ m (x – X
A
)
R=
(X
C
– x)
2
+ (Y
C
– y)
2
m =
Y
A
– Y
B
X
A
– X
B
( )
128
α
( )
V
2
V
1
A
[d B]= 20 log
10
[d B] (V
2
/
V
1
> 0)
υ
r
2
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