【简答题】设函数y=kx 2 +(2k+1)x+2(k为任意实数) (1)求证:不论k为何值,该函数图象都过点(0,2)和(-2,0); (2)若该函数图象与x轴只有一个交点,求k的值.
【单选题】It was _____ he came bank from Africa that wear _________ he met the girl he would like to marry.
【单选题】如图甲所示的电路,当闭合开关S后,两个电压表指针偏转均如图乙所示,则电阻R1和R2两端的电压分别为 ( )
【简答题】设函数y=a x -b(a>0,a≠1)的图象过点(1,2),函数y=log b (x+a)(b>0,b≠1)的图象过点(0,2),则a+b等于______.
【单选题】It was ________ he came back from Africa that year ________ he met the girl he would like to marry. [ ]
【单选题】Was it from the lake ________ he often went fishing ________ he saved the drowning girl?
【简答题】(本小题满分10分) 设函数 ( 为任意实数) 小题1:(1)求证:不论 为何值,该函数图象都过点(0,2)和(-2,0); 小题2:(2)若该函数图象与 轴只有一个交点,求 的值.
【单选题】He was so deep in love with that girl that he was willing to trade everything () her love.
【简答题】在如图所示的电路中,电阻R1=30Ω.开关S闭合后,两电流表的示数分别为0.3A和0.8A.求: (1)通电1min内,电流经过R1、R2时所做的功W1、W2. (2)通电1min内,整个电路消耗的电能.
【简答题】设函数f(x)=log a (x+b)(a>0,a≠1)),的图象过点(2,1)和点(8,2),则a+b=______.