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【简答题】
已知函数f（x）= 1 2 x 2 +2ax，g（x）=3a 2 lnx+b．其中a，b∈R． （1）设两曲线y=f（x）与y=g（x）有公共点，且在公共点处的切线相同，若a＞0，试建立b关于a的函数关系式； （2）在（1）的条件下求b的最大值； （3）若b=0时，函数h（x）=f（x）+g（x）-（2a+6）x在（0，4）上为单调函数，求a的取值范围．
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举一反三
【单选题】Jenny was born ____.
A.
in the year 1980, at 10 a.m. on June 14th
B.
on June 14th at 10 a.m. in the year 1980
C.
at 10 a.m. in the year 1980 on June 14th
D.
at 10 a.m. on June 14th in the year 1980
【单选题】质量为m的物体,在距离地面h高处以g/3的加速度由静止竖直下落到地面,下列说法中错误的是( )
A.
物体的重力势能减少mgh/3
B.
物体的机械能减少2mgh/3
C.
物体的动能增加mgh/3
D.
重力做功mgh
【单选题】Jenny was born
A.
on July 10, 1987
B.
in July 10, 1987
C.
in 1987, July 10
D.
on 1987, July 10
【简答题】普萘洛尔禁用于：
【单选题】Jenny was born .
A.
on July 10, 1987
B.
in July 10, 1987
C.
in 1987, July
D.
on 1987, July 10
【单选题】Jenny was born _______.
A.
on July 10, 19 9 7
B.
in July 10, 19 9 7
C.
in 19 9 7, July 10
【简答题】说明文阅读训练.doc
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