A:Where did you go?
B:How did you go there?
用鱼缸养金鱼时,数量过多,就会出现金鱼频频浮头,并导致死亡,这是因为( )
已知7163=209×34+57,209=57×3+38,57=38×1+19,38=19×2.根据上述系列等式,确定7163和209的最大公约数是____