The new-designed car is on show now. I wonder ___________.
A:how much it cost
B:how much it costs
C:how much did it cost
D:how much does it cost
唐玄宗后期,藩镇权限增大,这表明( )
已知二次函数y=ax2+1的图象为抛物线C,过顶点A(0,1)的直线l与抛物线C相交于另外一点P,点Q为抛物线C上另外一点,且点M(0,m)到直线l的距离为1.
(Ⅰ)若直线l的斜率为k,且|k|∈ 33 , 3 ,求实数m的取值范围;
(Ⅱ)当m= 2 +1时,△APQ的内心恰好是点M,求此二次函数的解析式.
修一条公路,如果每天修这条路的 215 ,8天能修完吗?( )