ÿþE g z a m i n z A l g e b r y , 7 I I 2 0 1 4 g o d z . 1 2 . 0 0
1 . Z a d a n i e w s t p n e
N r Z a d a n i e O d p .
1 D l a j a k i e g o a " R , R e ( 1 + a i ) 2 = 1 ? a = 0
R o z w i z a n i e :
R e ( 1 + a i ) 2 = R e ( 1 + 2 a i - a 2 ) = 1 - a 2
1 - a 2 = 1 = Ò! a 2 = 0 = Ò! a = 0
2 D l a j a k i e g o m w e k t o r p = [ m , 2 , - 1 ] j e s t r ó w n o l e g By d o p Ba s z c z y z n y m = 2
À : x + 2 y + 6 z - 1 = 0 .
R o z w i z a n i e :
n = [ 1 , 2 , 6 ] w e k t o r n o r m a l n y p Ba s z c z y z n y À
p æ% n = 0 = Ò! m + 4 - 6 = 0 = Ò! m = 2
x 1 0 1 0 0
3 D l a j a k i e g o x s p e Bn i o n a j e s t n i e r ó w n o [ 0 x 1 0 > 1 x > 1
0 0 x
R o z w i z a n i e :
x 1 0 1 0 0
0 x 1 0 = x 3 m a c i e r z t r ó j k t n a
0 0 x
x 3 > 1 = Ò! x > 1
4 W y z n a c z y r ó w n a n i a a s y m p t o t k r z y w e j K : x 2 - y 2 = 1 y = ± x
R o z w i z a n i e :
T a k r z y w a t o h i p e r b o l a , a = 1 , b = 1
y = ± x r ó w n a n i a a s y m p t o t
5 D l a j a k i e j w a r t o [c i p a r a m e t r u a p o w i e r z c h n i a w a l c o w a x 2 + ( y - a ) 2 = 2 5 a 1 = 1 1
j e s t s t y c z n a d o p Ba s z c z y z n y y - 6 = 0 a 2 = 1
R o z w i z a n i e :
"
P r o m i e D p o w i e r z c h n i w a l c o w e j R = 2 5 = 5
O d l e g Bo [ o s i o d p Ba s z c z y z n y j e s t r ó w n a d = | a - 6 | .
P o w i e r z c h n i a j e s t s t y c z n a d o p Ba s z c z y z n y , g d y :
d = R = Ò! | a - 6 | = 5 = Ò! a - 6 = ± 5
1
2 . R o z w i z a r ó w n a n i e ( z 3 + z 2 + z ) ( z 2 - ( 3 + 2 i ) z + 3 i + 1 ) = 0 , z " C
R o z w i z a n i e :
( z 3 + z 2 + z ) ( z 2 - ( 3 + 2 i ) z + 3 i + 1 ) = 0 = Ò!
z 3 + z 2 + z = 0 l u b z 2 - ( 3 + 2 i ) z + 3 i + 1 = 0
R o z w i z u j e m y r ó w n a n i e :
z 3 + z 2 + z = 0 = Ò!
z ( z 2 + z + 1 ) = 0 = Ò!
z 1 = 0
z 2 + z + 1 = 0
" "
" = - 3 = Ò! " = ± i 3
"
- 1 - i 3
z 2 =
2
"
- 1 + i 3
z 3 =
2
z 2 - ( 3 + 2 i ) z + 3 i + 1 = 0 = Ò!
" = ( - ( 3 + 2 i ) ) 2 - 4 ( 3 i + 1 ) = 9 + 1 2 i - 4 - 1 2 i - 4 = 1
"
" = 1
3 + 2 i - 1
z 4 = = 1 + i
2
3 + 2 i + 1
z 5 = = 2 + 1
2
O d p o w i e d z:
" "
- 1 - i 3 - 1 + i 3
z 1 = 0 , z 2 = , z 3 = , z 4 = 1 + i , z 5 = 2 + i
2 2
2
3 . R o z w i z a n i e r ó w n o [
1 1 1 1 2
1 2 1 x 2
3 3 x - 1 0 <