Ответ:
3/4,5 =5/DF
DF=4,5*5/3
DF=7,5
5/7,5=4/FM
FM=7,5*4/5
FM=6
BM=4,5+7,5 +6 =18
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Ответ:
3/4,5 =5/DF
DF=4,5*5/3
DF=7,5
5/7,5=4/FM
FM=7,5*4/5
FM=6
BM=4,5+7,5 +6 =18