∵圆N与x轴相切,∴圆N为:(x﹣6)2+(y﹣n)2=n2,n>0,
又圆N与圆M外切,圆M:x2+y2﹣12x﹣14y+60=0,即圆M:((x﹣6)2+(x﹣7)2=25,
∴|7﹣n|=|n|+5,解得n=1,
∴圆N的标准方程为(x﹣6)2
在化学方程式:Cu+2H2SO4(浓)═CuSO4+X↑+2H2O中,X的化学式是( )
根据句意和首字母提示,完成句中所缺单词。(1)We can go to the countryside to enjoy the f____ air.(2)Many students want to go a____ for further study.(3)Mary is now watching a film in a nearby____ (电影院).(4)Mount Fuji is the____ (象征) of Japan.(5)The c____ (会议) has been over for an hour.