вроди так
Р (АВС)=AB+BC+ACР (АВD)=AB+BD+1/2ACBD=P(ABD)-AB-1/2ACAB=AC P(ABC)=2AB+ACAB=1/2P(ABC)-AC/2
BD=40-1/2 50+1/2AC-1/2AC=40-25=15
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вроди так
Р (АВС)=AB+BC+AC
Р (АВD)=AB+BD+1/2AC
BD=P(ABD)-AB-1/2AC
AB=AC P(ABC)=2AB+AC
AB=1/2P(ABC)-AC/2
BD=40-1/2 50+1/2AC-1/2AC=40-25=15