ABCD

A

B

=

6

AB=6

B

C

=

8

BC=8 .

7

.

7 . :

A

B

→

,

  

B

C

→

,

  

C

D

→

,

  

D

A

→

AB

,

BC

,

CD

,

DA

( ).

:

(couple).

.

asked by guest
on Dec 14, 2025 at 2:52 am



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