分解因式:x2-2xy-9+y2=______.
原式=(x2-2xy+y2)-32
=(x-y)2-32
=(x-y+3)(x-y-3).
故答案为:(x-y+3)(x-y-3).
The state-run company is required to make its accounts as _________ as possible for its staff to monitor the use of the money.
A.punctual
B.accurate
C.vertical
D.transparent
高渗性非酮症性糖尿病昏迷()
A.尿糖(++++)酮体(-)
B.尿糖(++++),酮体强阳性
C.尿糖(-),酮体(-)
D.尿糖(+),酮体(+)
E.尿糖(-),酮体(+)