因式分a2b2-a2c2=______.
a2b2-a2c2
=a2(b2-c2)
=a2(b+c)(b-c).
故答案为:a2(b+c)(b-c).
Moscow is going to be ____________ and ____________.[ ]
A. rain, wind
B. rainy, windy
C. raining, winding
下列各表达式中是函数的化简式的是()。
A.A+BC
B.1
C.
D.