.


:




:

































 

 

 

 


17.

 

1. 159 . ., 139,7 . ., 87,6 . ., 7,8 . ., ?

 

.

 

= (./ . )*100%

= + = 87,6 + 7,8 = 95,4

= (7,8/95,4)*100% = 8,17%

 

2. 100 . ., 75 . ., 60 . ., 11%,

 

.

 

=( / )*100%

= ( * .)/100%=0,11*60=6,6 .

= +

= . = 60 6,6 = 53,4

 

3. 12 . ., 8%,

 

.

 

= ( / )*100%

= +

8% = (12/ + )*100% = (12/(+12))*100%

= 138

 

4. 95 . ., 85 . ., 25 . ., 9%, ?

 

.

 

=( / )*100%

= +

= = 85 25 = 60

= 9% = (/60)*100%

= 0,09*60 = 5,4 .

 

5. : 0?

 

.

 

. , , ( ). , , , . 6-7%

 

6. , ?

 

.

 

, , .

 

7. ?

 

.

 

, . .

 

8. 5%, 4 . ., 3 . ., 2,8 . ., ?

 

.

 

= (- U/ - L)*100%

U=U.+U.+U.=4+3+2,8=9,8 .

=((U+U)/L)*100%

L=((U+U)/ .)*100%=140 .

= (9,8/140)*100%=7%

 

9. 175 . ., 6%, 9%, 3 . ., 4,5 . , ?

 

.

 

u = u u = 9% - 6% = 3%

(U- - , u )

u = (U /L)*100%

L=(U/u )*100% = 4,5/0,03=150 .

u = (U/L)*100%=(3/150)*100%=2%

u = u +u

u = 6% - 2% = 4%

 

 

10. 300 . ., 250 . ., 7 . ., 8 . ., 10 . .., 175 . . 1770 . ., 2000 . .,

 

.

 

:

(( )/ ) *100%= -k(u u )

 

u = (U/L)*100%

u = (U/L)*100%

u = (U/L)*100%

u = u + u

u =u + u

L ( .) =E+U= +

U=U +U +U = 7+8+10= 25 .

L=175+25=200 .

u . = (7/200)*100%=3,5%

u = (10/200)*100%=5%

u = (8/200)*100%=4%

u = 3,5+4=7,5%

u = 7,5+5=12%

( )/ = -k(u u )

((2000-1770)/2000)*100%= - k(12,5-7,5)

K= 0,115/0,05 = 2,3

 

 

11. 6,5%. 5%, 2. 2550 . . ( %) , .

 

.

 

(( )/ )*100% = -k(u u )

-

(( )/ )*100% = - 2*(6,5-5)= -3

(( 2550)/2550))*100% = -k(u u )

(( 2550)/2550))*100% = -k(0,065 0,05)

= 2473.5 .

= = 2550 2473,5 = -76,5

 

13. 1200 . 1248 ., 7%, ?

 

.

 

. = / = 1248/1200 = 1,04

= (100%+7%)/100%=1,07

= ( ./)*100%=(1,04/1,07)*100%=97%

, 3% (100% - 97%)

 

 

: 12-13 5 ;

10-11 4 ;

7-9 3 ;

4-6 2 ;

4- 0 .

 

 



<== | ==>
 |
:


: 2016-10-06; !; : 19529 |


:

:

, , .
==> ...

1780 - | 1465 -


© 2015-2024 lektsii.org - -

: 0.012 .