1.
1:
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. , , , , .
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. 2.
, . , , μ = tg α, α . . , β , (. 2). N2 = F1 = μ1N1, F2 = μN2. O1 O2 :
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μ1 = l / (2h + μl). μ2.
2:
, , , , . ( ) , , , . t1 = 4 , 1,25mg; , t2 = 3 , , mg. ( ) t3 = 25,12 1,25mg. , t4 = 4 . , . , .
3:
, 3.8*10^8 . , 6400 ., 10/^2.
4:
70 . 350 . , 12 . , .
5:
.
6:
22 100 5 . 4.2 /(*). 2.3 . , , ?
7:
: 1- h1 = 44 , 2- h2 = 11 1-. . , . , .
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8:
m. ( ) . ? t , , , t0. , (̻ m). .
9:
1.
f1(x) = 2+2a1x+b1,
f2(x) = 2+2a2x+b2,
f3(x) = 2+2a3x+b3
,
123 = b1b2b3
1 , .
10:
1,2,...,7
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, .
( , , , .)
, .
, .
11:
- K 1 K , ?
12:
ABC 60o. 1 1 .
, , B1C1 .
2.
1:
, . 10 , , , , 1 . . .
(3 )
2:
, 2 /, , 0.02. , , 30.
(3 )
3:
, , , . .
(5 )
4:
0.3 , 30. 5 . , 45. 0.2 . , 30. , . . 20.
(5 )
5:
L . , n . x m, .
(5 )
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6:
11 .
.
, .
, - .
7:
, , , < .
, b, 1 1
( 1 1 ).
, 11 ⊥ .
8:
,
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, ,
.
9:
n Sn n :
S1 = 2, S2 = 2 + 3 = 5, S3 = 2 + 3 + 5 = 10,...
(Sn) ?
10:
n,
:
1. n 10 ;
2. n 10
3.
1:
20 3,6 /. , , , . , 20%. , 0,5 ?
(10 )
2:
m = 200 . . , ( C1 = 2100 /, C2 = 4200 /).
(10 )
3:
500 . , ? 1000 /3, 1030 /3.
(10 )
4:
r = 0,08 I1 = 4 P1 = 8 . , P2 I2 = 6 .
(10 )
5:
, . 1 /, , 2 /. , .
(10 )
6:
.
7:
, .
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8:
.
, ,
2 ?
9:
10 5 20 3000 /3.
, 40% .
, , .
10:
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11:
, .
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12:
.
, ,
3 ?
13:
5 5 10 4000 /3.
, 40% .
, , .
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