>> 10 .

1.

 


7.

, . , , . .

1. . 80 /, 60 /. .

. 1, 2. (1.9)

2 = '2 + 1,

'2 .

'2 = 2 - 1.

1.21. , , , . '2

υ'2 = υ2 - υ1 = -20 /.

   υ<sub>1</sub>

2. υ = 1,5 /. υ1 , υ2 = 2 / .

. (1.9)

2 = 2 - .

1 = 1 + .

2 1.22.

, 1 = 2,5 /.

3. , 300 /, . - 100 / . , , , .

. , . 2 '2 :

2 = '2 +                         (1)

1.23 , 2 '2 . , : '2x = -x.

'2cosα = cos45. (2)

OY (1) 2y = '2y + y.

2y = '2sinα - sin45, .

(2) α:

  α

: α = 76.

(3) sinα:

    1. 36 /, 9 /. . 90 . ?

    2. 72 / 108 /. 900 , 140 . ?

    3. 35 /. , , 60 , ? .

    4. 1 . , 45 . , ?

 

 

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