-3 = b , : = b+3.
1) ≠0, = b;
2) =0, b= -3 0=0, ;
3) =0 b≠-3, 0 = b +3 ≠0, , .
³. ≠0 b = ; =0 b = -3 ; =0 b≠0 .
2. :
(-1)(+1) -1 =0 .
.
: (-1)(+1) = +1.
(-1)(+1) =1
= -1, :
1) = 1 0 = 2, ;
2) = -1 0 =0, ;
3) | | ≠1 (-1)(+1) ≠0,
= .
³: || ≠1 ; = -1 ; = 1 .
3. :
(+4) 2,5 = (-2)(+3) + 3,5.
.
, :
(+4) 2,5 -3,5 = (-2)(+3),
(+4-2,5 -3,5) = (-2)(+3), (-2) = (-2)(+3).
≠2,
.
= 2, 0 =0, .
³: ≠2 = +3; =2 .
4. :
7,5 2 2= 5,5 3 -4.
.
, :
7,5 2 5,5 +3 = 2-4,
(+2) = 2 -4, (+2) = (-2)(+2).
= - 2,
0 =0 .
≠ -2,
=
³: =-2 ; ≠2
= -2.
5. :
|-1| = |+3|.
г | -1| = |+3|. , :
1) -1 = +3;
2)-1 = - (+3).
.
1) -1 = +3, - = 4, (-1) =4.
=1, 0=4. г .
≠1, = .
2) -1 = - (+3), -1 = --3, + = -2, (+1) = -2.
= -1,
0 = -2. .
≠, = .
³: || ≠1 1= , 2= ; = -1
= ; = 1 = .
6. .
. 2(-1) = 3(5-),
(2-15) = 2-3.
= 0 = - . , , .
≠
=
, .
, , :
5- ≠0 -1 ≠0. =
10-15 -22+15 ≠0 2-32-2+15 ≠0, ≠
, ≠ ≠ , =
|
|
= .
7.
. ≠0, ≠ .
- = b, (b+1) = .
b = -1, = 0, - = b, (b+1) = 0 = 0. , .
b = - 1, ≠ 0, 0 = . .
b ≠ - 1,
= .
, b .
, ≠ 0 ≠0, ,
≠ 0 b ≠ 0.
, b = -1, =0, , ,
= 0, =.
b = 1, ≠0, .
≠ 0, ≠ 0, b ≠ -1, = .
8. 2m(m-2) = m-2.
, , m = 0 m = 2. , m =0, m =2, , m ≠0, m ≠ 2 .
, 2m(m-2) = m-2 :
1) m = 0; 2) m = 2; )
1) m = 0, 2m(m-2) = m-2. 0 = - 2. .
2) m = 2, 2m(m-2) = m- 2. 0 = 0. .
3) m ≠ 0 m ≠ 2, 2m(m-2) = m-2.
=
³. m = 0, ; m =2, ; .
9. .
.
:
, .
+ = 42 1, (2 1) = 42 1.
= ,
0 = 0 .
≠ = 2 + 1.
, .
³. = ;
≠ , ≠ 0; ≠ 1 = 2 + 1; = 0, = 1 .
10.
( 2 1) = + 1.
. :
1) = 1; 0 =2 ;
2) = -1; 0 = 0 , , - ;
3) ≠ 1; = .
³. = - 1, - ;
= 1, ; ≠ 1; = .
11.
. = - . , ≠ 1 ≠ 1.
³. ≠1, = ; =1, .
12.
. :
( + -1)( +1) 3( +1) = 5 ;
2 + ( -3) - 4 -4 =0. 1 =4, 2 = - -1. , , : 1 ≠ 1 - , 2≠ -1,
1 ≠ -1, 2 ≠ 1 - . .
1 =1 - , 4 = 1 - , = -3. , = -3, 1 = 4 . , = - 3 . = -3 2 =2, 2 =2 .
|
|
2 =-1, - -1 = -1, =0. =0, 2 , 1 .
³. = -3, =2; =0, =4; ≠0 ≠ -3,
=4 = - -1.
13. =1.
. , : = =0, .
³. =0, ; ≠ 0, =
14. | 2-1| + | ( -1) | = 0.
.
:
≠0, : =1.
=0, , - . , : =1 = -1.
³. ≠0, =1; =0, = 1.
15.
( -1) =0
.
= - , =1 , ≤1
³. 1, = =1; =1, =1; 1, = .
16. 2- +3 =0 ?
. : . . , , , =0. , =0, , .
≠0, . 1 - 12 , , = .
³. =0 = .
17. ( -2) 2 +(4 - 2 ) +3 =0.
. , , =2. =2, .
≠ 2, , , . , = 2 = 5. , = 2 , = 5.
³. = 5
18. ( + 3) 2 + (2 +6) - 3 -9 =0 ?
. = 0 = -3.
= 0, .
, .
, , , 4(1 + 3 ) , . =0, = -3.
³. = -3, -
19. ?
. , , . ≠0 . , ! -3. : D= 2 -4, D =0,
= 2; = -3 ,
=- , 3.
³. = 2 = -
20. 2- - =0
?
. , , , , . , =0, . 0, , . .
³. ≤ 0.
21. |-1|=|+3|.