— ________ have you stayed in this hotel?
— Not long, just ________ this Monday.
A:How soon; from
B:How long; since
C:How many days; for
D:How often; on
用公式法求一元二次方程的根时,首先要确定a、b、c的值.对于方程﹣4x2+3=5x,下列叙述正确的是( )