18 = 280 000 ./., 1 = 1000 ./. ( ) , :
, ./. | |||||
, ./. |
.
, ( , , ).
:
= ,
1700 :
= =400 ,
.. 400 1700 .
:
, ./. | |||||
, ./. |
. .
19 ( ≤ 3000 ./.) ( ≤ 80 ./.). : = 160000 ./., 1 = 2000 . . , 1. ?
3000 ./.:
= =160 .
. 160 . 80 , , .
20. 1600 ./. ≤ ≤ 2100 ./. 1000 ./. ( ), 40 000 . 80 000 .
.
:
=-,
=* q
=+,
,
=1*q, 1 , q .
, :
=* q-(+1* q)
:
1600 ./.:
40000=1600* q-(80000+1000* q)
600 q=120000
q=200
2100 ./.:
40000=2100* q-(80000+1000* q)
1100 q=120000
q=109
. 109 . ≤ q ≤ 200 .
|
|
21. N 120 . , , = 36 400 . 1 = 28 000 , = 700 000 .
2 60 . . , , .
.
, , . , , , . , .
22. N , , . , : 300 , 200 . 120 . 2000 ./., 600 ./. . : 1 1000 ./.; 2 2400 ./. 1 30 , 2 100 . .
.
200 .
1 .
= =45
, 30 .
2
= =63
, 100 .
. 200 .
23. 1 1 = 100 ./., = 170 ./. , , 8000 ./. , 12000 ./.
.
:
=-
=* q
=+,
,
=1*q, 1 , q .
, :
=* q-(+1* q)
:
12000=170* q-(8000+100* q)
12000=170 q-8000-100 q
|
|
70 q=20000
q=286
. 286 12000 ./.
24. 2300 , 1000 , 80 000 . , 15%?
.
:
/=
:
/=
:
= 15%
2300 q-80000-1000 q=0,15(80000+1000 q)
1150 q=92000
q=80
. 80 15%.