先化简再求值:
[(x+2y)(x-2y)-(x-4y)2]÷ (4y),其中x=5,y=2。
解:
当时,原式=0
The border was actually two towns, though no one was big enough to amount toanything.
A.not one
B.neither one
C.none
D.nor
活塞裙部的形状通常是()
A、圆形
B、椭圆
C、不规则形状