) .
1. : Q = 300 - 2.
,
= 75.
Q
P
E Q
P
D
P
D = ()′ ⋅.
QD(75)
= 300 2 75 = 150. => (QD)' = -2
P ED
= -2
⋅ = -1, .
2. ,
: QS = 3p 4; p = 2
S
S
P
S Q
P
E = Q()′⋅
p = 2, QS = 3 2 4 = 2.
S
S
P
S Q
P
E = Q()′⋅ = 3
= 3
:
1. , ES >1.
2. 1% 3 % .
3. ,
:
P1 = 4; P2 = 3
QD1 = 20; QD2 = 30
P
P
Q
Q
E
P
D
∆ ∆
=:
∆ Q = Q2 Q1 = 30 20 = 10 ∆ = 2 1 = 3 4 = -1
5,3
4 3
;25
20 30
1 2 1 2 =
+
=
+
= =
+
=
+
=
P P
P
Q Q
Q
5,3
()1
:
:
−
=
∆ ∆
=
P
P
Q
Q
E
P
D
= - 1,4 = 1,4>1
:
1. , ED>1
2. 1% 1,4%
.
4.
, :
Py1 = 5; Py2 = 3.
QDx1 = 2; QDx2 = 3
Py
Py
Qx
Qx E
Py
Dx
Λ ∆
=:
∆Q = QD2 QD 1 = 3 2 = 1
∆ = 2 1 = 3 5 = -2
5 3
;5,2
2 3
1 2 1 2
=
+
=
+
= =
+
=
+
=
y y
y
x x
x
P P
P
Q Q
Q
:
5,2
1 −
=
Py EDx) = - 0,8 < 0.
:
1. , -0,8<1
2. Y 1% X 0.8%
.
3. , (.
5. ,
: QD = 4 + 3 I; I1 = 2; I2 = 4
I
I
Q
Q
E
I
D
Λ ∆
=:
I1 = 2, QD = 4 + 3 2 = 10
I2 = 4, QD = 4 + 3 4 = 16
2 4
;13
10 16
1 2 1 2 =
+
=
+
= =
+
=
+
=
I I
I
Q Q
Q
4 2
:
16 −10 −
=
I ED ≈ 0,69
:
1. , 0,69<1
2. 1% 0.69%
.
3. , :
0,69>0.
4. 0<ED<1, .
6. : QD = 100 ,
|
|
|
: QS = 2 50.
:
1) .
2) .
1. , QD = Qs
:
100 = 2 50
3 = 150
= 50 . . 85
QD = 100 = 100 50 =50 .
QS = 2 50 = 50 2 50 = 50 . '
QD = QS = Q
= 50 . .
2.
Q
P
E QD
P
D = ()′⋅.
(QD) = (100 )' = -1
= (−)1 ⋅
P ED
= -1, .
3.
S
S
P
S Q
P
E = Q()′⋅
(QS) = (2 50) = 2
= 2 ⋅
P ES
= 2, .
7. ֳ 1,5 2 . ., - 900
1000 . .
P
P
:
Q
Q
E
S
P S
S
Λ ∆
=
∆QS = QS2 Q S1 = 1000 900 = 100
∆ = 2 1 = 2 1,5 = 0,5
75,1
5,1 2
950;
900 1000
=
+
= =
+
Q = P
75,1
5,0
:
=
P ES = 0,37<1,
.
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