抛物线y=-4(x+2)2+1的顶点坐标是______.
∵y=-4(x+2)2+1为抛物线的顶点式,
根据顶点式的特点,顶点坐标为(-2,1)
故本题答案为(-2,1).
碳和碳的化合物是自然界中重要的物质,请回答下列问题:
(1)金刚石和石墨的物理性质有很大的差异,其原因是什么? .
(2)NaHCO3俗称小苏打,举出NaHCO3在生活中的一种用途. .
I am wondering ______________.
A.why did he come to school late
B.why he came to school late
C.that he came to school late
D.why was he late for school