1. :
(1) |
). = 0, 2+4 = 0 Û = 2;
). ¹ 0, D = 1 4; 1 4 < 0 Þ > Î Æ;
1 4 ³ 0 Þ £ .
: = 0 = 2; ¹
0 £
(1)
; ¹ 0 >
(1) .
,
.
1. b > 0,
c > 0, ; b
< 0, c > 0,
.
2. ,
d:
2. , :
(1) |
(1) , ¹ 0,
(2) |
1: ;
1). D = ; 2,
; .
2). > 0;
:
= 2 ¹ 0.
(. 1).
< 2, > 0
|
3). ; : = 3
¹ 0. (. 2).
3 < < 0.
|
4). :
(. 3) |
|
: (1) .
3. , 1:
(1) |
2: .
1).
> 0, 8,
: .
(. 4).
|
< <
2). , 2 , ¹ 0;
2 + 1 > 2 Þ 2 2 > 1 Þ 0 > 1 Þ Î R.
3). Y(1) = 2 2;
2(-1) > 0: 1 = 0; 2 = 1.
(. 5).
|
< 0, > 1
4). :
(.6) |
|
|
|
: (1) 1.
4.
2 4:
1: | (1) |
; (1): . 2 4:
(. 7).
|
2:
2:
1). D = 1 > 0;
2). ;
3). Y(2) = 2+4+3
2+4+3 > 0; 2+4+3 =
0: 1 = 3, 2 = 1;
(. 8).
|
< 3, > 1.
Y(4) = 28+15
28+15 > 0; 28+15 =
0: 1 = 3, 2 = 5;
(. 9).
|
< 3, > 5.
4). :
(.10) |
|
1 < < 3.
: = 2 (1) 2 4.
5. ,
21+2 = 3:
: ;
:
1 = 1, 2 = 1,
= 1.
: = 1.
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