# 10

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"10"

```					                                                                  .4

26                                   04

:                       .4
:
x             (O,I)                                       M                       x
|x|= OM           ; | x| ,                          OM                  x

:
a =|a|          a        a
- a = | a|         –a        a

:
:                             y       x
x  x
1) − x = x   . 2) x = x2
3) xy = x × y           4) y = / y≠ 0
y

5) x + y ≤ x + y

.5

b a                 (O, I)                                          B       A
AB= a − b = b − a
:
.
:       (b − a           )a−b                     b   a
d(a ;b) = b − a = a − b

.                                   46                 62

-         -                                1                                                              :
.4

39
39

.            46    54

-   -       2                        :

```
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