: 1) ³ ;
2) ³ .
1 1) 2+5-3=0,
34+43-122-5=0;
2) 0,5+1=(-2)2,
(-3)cosx=1, -2π≤x≤2 π;
2 1) arctgx-1/3x3=0,
23-92-60x+1=0;
2) log2(-x)(x+2)=-1
sin(x+π/3)-0,5x=0;
3 1) 5+3=0,
4--1=0;
2) 2-2+0,5=0,
(-1)2lg(+11)=1;
4 1) 2ex=5+2,
24-2-10=0;
2) log3(x+1)=1,
cos(x+0,5)= x3;
tgx=x+1; π/2≤x≤ π /2;
5 1) 3-1-2-=0,
34+83+62-10=0;
2) (-2)2log0,5(x-3)=-1
5sinx=x;
6 1) arctgx-1/3x3=0,
4-18x2+6=0;
2) x22=1;
tg(x+1)=1, π /2≤x≤ π /2;
7 1) e-2x-2+1=0,
4+43-82-17=0;
2) 0,5-1=(+2)2,
x2cos2x=-1;
8 1) 5-6-3=0,
4-3-2x2+3x-3=0;
2) x2-0,5-3=0;
lg(+1)=1;
9 1) arctg(x-1)+2=0,
34+43-122+1=0;
2) (-2)22x=1,
x2 -20sinx=0;
10 1) 2arcctgx-x+3=0,
34-83-182+2=0;
2) 2sin(x+ π/3)=o,5x2-1,
2lg-x/2+1=0;
11 1) 3+2-2=0,
24-83+82-1=0;
2) [(-2)2-1] 2 =1
(-2)cosx=1, -2 π ≤x≤2 π;
12 1) 2arcctgx-3x+2=0,
24+83+82-1=0;
2) [log2(x+2)](x-1)=1,
sin(x-0,5)-x+0,8=0;
13 1) 3+2-5=0,
4-43-8x2+1=0;
2) 2-3+0,5=0,
(-1)2lg(+11)=1;
14 1) 2ex+3+1=0,
34+43-12x2-5=0;
2) log3(+1)=2;
cos(x+0,3)= x2;
15 1) 3-1-4-=0,
23-92-60x+1=0;
2) (-3)2log0,5(x-2)=-1
5sinx=x;
16 1) arctgx-1/3x3=0,
4--1=0;
2) (-1)22x=1,
tg3x=x-1;
17 1) ex++1=0,
24-2-10=0;
2) 0,5-3=(+2)2,
2cos2x=-1, -2 π ≤x≤2 π;
18 1) 3-2+5=0,
34+83+6x2-10=0;
2) 22-0,5-2=0,
lg(+1)=1;
19 1) arctg(x-1)+3-2=0,
4-18+6=0;
2) (-1)22x=1,
x2 -20sinx=0;
20 1) 2arcctgx-+3=0,
4+43-8x2-17=0;
2) 2sin(x+ π/ 3)=x2- 0,5,
2lgx-x/2+1=0;
21 1) 2-3-2=0,
4-3-22+3x-3=0;
2) 0,5+1=(-2)2,
(-3)cosx=1, -2 π ≤x≤2 π;
22 1) arcctgx+2x-1=0,
34+43-12x2+1=0;
2) (x+2)log2(x)=1,
sin(x+1)=0,5x;
23 1) 3+2-3=0,
34-83-182+2=0;
2) 2-4+0,5=0,
(-1)2lg(+11)=1;
24 1) 2ex-2-3=0,
34+43-12x2-5=0;
2) xlog3(x+1)=1,
cos(x+0,5)= x3;
25 1) 3+2+=0,
23-92-60x+1=0;
2) (-4)2log0,5(x-3)=-1
5sinx=x-0,5;
26 1) arctg(x-1)+2x-3=0,
4-x-1=0;
2) (x-1)22=1;
tg3x=x+1, π /2≤x≤ π /2;
27 1) e-2x-2+1=0,
24-2-10=0;
2) 0,5-3=-(+1)2,
x2cos2x=-1, -2 π ≤x≤2 π;
28 1) 3-2-5=0,
34+83+6x2-10=0;
2) 2x2-0,5-3=0;
lg(+1)=1;
29 1) arctg(x-1)+2=0,
4-18x2+6=0;
2) (-1)22x=1,
2-10sinx=0;
30 1) 3+5-2=0,
34+43-122+1=0;
2) 0,5+1=(x-2)2;
(+3)cosx=1, -2 π ≤x≤2 π;
31 1) e-2x-2+1=0,
4+43-82-17=0;
2) 0,5-1=(+2)2,
x2cos2x=-1;
32 1) 5-6-3=0,
4-3-2x2+3x-3=0;
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2) x2-0,5-3=0;
lg(+1)=1;
33 1) 3+2-5=0,
4-43-8x2+1=0;
2) 2-3+0,5=0,
(-1)2lg(+11)=1;
34 1) 2ex+3+1=0,
34+43-12x2-5=0;
2) log3(+1)=2;
cos(x+0,3)= x2;
35 1) 3+2-2=0,
24-83+82-1=0;
2) [(-2)2-1] 2 =1
(-2)cosx=1, -2 π ≤x≤2 π;
36 1) 2arcctgx-3x+2=0,
24+83+82-1=0;
2) [log2(x+2)](x-1)=1,
sin(x-0,5)-x+0,8=0;
1) ³ ( ):
x4-x3-2x2+3x-3=0
f(x)=x4-x3-2x2+3x-3, (x)=4x3-3x2-4x+3. , :
4x3-3x2-4x+3=0, 4x(x2-1)-3(x2-1)=0, (x2-1)(4x-3)=0,
x1=1, x2=-1, x3=3/4;
:
X | -∞ | -1 | 3/4 | +∞ | |
Signf(x) | + | - | - | - | + |
, :
x1 (-∞;-1], x2 [1, +∞).
:
X | -2 | -1 | ||
Sign f (x) | + | - | - | + |
, x1 [-2;-1], x2 [1, 2].
, x1 [-2;-1] 쳿 . :
n | an | bn | xn= | x4n | -x3n | -2x2n | 3xn | F(xn) |
-2 | -1 | -1,5 | 5,0625 | 3,375 | -4,5 | -4,5 | -3,5625 | |
-2 | -1,5 | -1,75 | 9,3789 | 5,3594 | -6,125 | -5,25 | 0,3633 | |
-1,75 | -1,5 | -1,63 | 7,0591 | 4,3307 | -5,3138 | -4,89 | -1,8140 | |
-1,75 | -1,63 | -1,69 | 8,1573 | 4,8262 | -5,7122 | -5,07 | -0,7981 | |
-1,75 | -1,69 | -1,72 | 8,7521 | 5,0884 | -5,9168 | -5,16 | -0,2363 | |
-1,75 | -1,72 | -1,73 | 8,9575 | 5,1777 | -5,9858 | -5,19 | -0,0406 | |
-1,75 | -1,73 | -1,74 | 9,1664 | 5,2680 | -6,0552 | -5,22 | 0,1592 | |
-1,74 | -1,73 |
x1≈-1,73
2) ³ ( ): x2log0,5(x+1)=1
log0,5(x +1)=1/ x 2, 1=log0,5(x +1), 2=1/ x 2 :
. 8.2
, x≈-0,8. 쳿 , f(x)=x2log0,5(x+1)-1. :
x | -0,5 | -0,8 |
Sign f (x) | - | + |
ϳ , ε=0,01.
.
Ms Excel. 2 , 3 . 2:3 . 8.3, . , 2 3 . 3 =(4+2)/2 2 3 ( . 8.4).
. 8.3.
. 8.4. . 8.5.
8.4, [-0,65; -0,8] . 3 4 (. 8.5). [-0,725; -0,8]. , . ϳ x ≈-0,73
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. 8.6.