分解因式:3x2-6xy+3y2=______.
3x2-6xy+3y2,
=3(x2-2xy+y2),
=3(x-y)2.
故答案为:3(x-y)2.
—You haven’t been to the West Lake in Hangzhou, have you?
—______. How I wish to go there! [ ]
A. Yes, I have
B. Yes, I haven’t
C. No, I have
D. No, I haven’t
产褥期变化最大的器官是()
A. * *
B.子宫
C.输卵管
D.卵巢
E. * *