Найдите значения дроби:
X^2-8x-33
10x+30 При x=-9

1) х^2 - 8х - 33 = ( x - 10 )( x + 3 ) D = 64 + 132 = 196 = 14^2 X1 = ( 8 + 14 ) : 2 = 10 X2 = ( 8 - 14 ) : 2 = - 3 2) 10x + 30 = 10( x + 3 ) 3) ( ( x - 10 )( x + 3 )) / ( 10( x + 3 )) = ( x - 10 ) / 10 = 0,1x - 1 4) x = - 9 0,1•( - 9 ) - 1 = - 0,9 - 1 = - 1,9