若x1,x2是一元二次方程3x+4=x2的两个根,则x1+x2等于( )
- What is your_______ for being late for class?
- Sorry, I got up late.
若对∀x,y∈0,+∞),不等式4ax≤ex+y﹣2+ex﹣y﹣2+2恒成立,则实数a的最大值是( )