oblicz:
Iksiński: Oblicz:
√38−12√2−√11−6√2
27 maj 11:36
AS: Skorzystaj z tożsamości
| | a + c | | a − c | |
√a ± √b = √ |
| ± √ |
| gdzie c = √a2 − b |
| | 2 | | 2 | |
27 maj 12:01
+-: (a−b)2=a2−2*a*b+b2
38−12*√2=36−2*6*√2+2 2=(√2)2 itp.
27 maj 13:11
Eta:
(6−√2)2= 36−12√2+2= 38 −12√2
(3−√2)2= 9−6√2+2= 11−2√2
√a2= |a|
to: ...... = |6−√2| + |3−√2| = 9
27 maj 13:23
+-:
= |6−√2| + |3−√2| = 9 nie
− =3
27 maj 13:44