? ,
- . . , .., , , . - , .
, . , . , . , , . , . , .
, , , .
. . , , , , . , , . . , ^ , , . .
, , , , , , . , , , , , . . , , , , . , , . .
, , .
. 5-7 . , , , , , .
I . : 2 3 60%- - ( ), 30 , 1 4 -
70%- , 90 . : 60%/32 + 60%/4 + 70%/4.
II . : 60%/42 + + 70%/.
. : 65%/42 + 70%/4
IV . : 2
, 60-65%
- . :
2x60-65% .
V . ( )
: 2x60% .
VI . : 2x60% .
. , , .