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½â:(1)¡ßAC=asin¦È AB=acos¦È ¡àS 1 = a 2 sin¦Ècos¦È= a 2 sin2¦È. ÉèÕý·½Ðα߳¤Îªx ÔòBQ=xcot¦È RC=xtan¦È ¡àxcot¦È+x+x...
ÉèA¡¢BΪÁ½Ëæ»úʼþ,ÇÒP(A)=0.4,P(A+B)=0.7.·Ö±ð¾Í...
P(A+B)=P(A)+P(B)+P(AB)1)A¡¢B»¥³âÔòP(AB)=0 P(B)=0.7-0.4=0.32)¶ÀÁ¢ P(AB)= P(A)*P(B) P(B)=0.53)P(AB)=0.25 Óɹ«Ê½¿ÉµÃP(B)=0.05