Repetytorium - Egzamin ósmoklasisty. Matematyka
- No tags were found...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Współrzędne środka odcinka<br />
AB, gdzie A= ( x y )<br />
A<br />
, i B x , y <br />
A<br />
= ( )<br />
B<br />
B<br />
x B + x A y B + y<br />
( , )<br />
A<br />
2 2<br />
Przykład<br />
8. -<br />
AB<br />
<br />
A= −6, −4 , B 4, 4 .<br />
( ) = ( )<br />
− 6+ 4 − 4+<br />
4<br />
S = ( ,<br />
2 2 )<br />
( ) S = −2 0<br />
,<br />
2 2<br />
( )<br />
S = −10<br />
,<br />
( , ) C = ( )<br />
9. BABA = −48<br />
20 , .<br />
B = ( x, y)<br />
,<br />
x y<br />
C = ⎛ ⎝ ⎜ + ( −4) + 8⎞<br />
,<br />
2 2 ⎠<br />
⎟ .<br />
C = ( 20)<br />
B = ( 8, −8)<br />
.<br />
, x − 4<br />
=<br />
2<br />
2 i y + 8<br />
=<br />
2<br />
0, x − 4=<br />
4 i y + 8=<br />
0, x = 8, y =−8.<br />
10. O, P, R, SP, R<br />
OR, OSO = −21<br />
( , ), R = ( 45)<br />
P x , y OR<br />
= ( )<br />
P<br />
P<br />
, P, S.<br />
− 2+<br />
4 2<br />
1+<br />
5 6<br />
x P = = = 1 y<br />
2 2<br />
P = = = 3 P = ( 13 , )<br />
2 2<br />
S x , y OSR.<br />
= ( )<br />
S<br />
S<br />
xO<br />
+ xS<br />
yO<br />
+ y<br />
x R =<br />
y<br />
2<br />
R =<br />
2<br />
2<br />
4 = − + x S 1<br />
5 = + y S<br />
2<br />
2<br />
8 =− 2 +x S 10 = 1 + y S<br />
x S = 10 y S = 9<br />
S = ( 10,<br />
9)<br />
S<br />
76