<<< ... ... ...>>>
: _ ( - - ) = ( 2 _ (-)2 2 _ (-)2
19 0.019 10 10 10 10
!!!!!!!!!!!!!!!! 019. 19 () **
() ... (2/1)/ ...
10 19 19 = 0.019 10 10 10 0.19
019 ,/10 0019 , 19,