Ответ:
KN=4 dm
Объяснение:
NB+KB+KN=12 (1)
2*NB+2*KB=16 => NB+KB=8 (2)
(2)-->(1) ==> 8+KN=12 => KN=4 dm
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Ответ:
KN=4 dm
Объяснение:
NB+KB+KN=12 (1)
2*NB+2*KB=16 => NB+KB=8 (2)
(2)-->(1) ==> 8+KN=12 => KN=4 dm