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【简答题】
已知函数f（x）=8ln（1+e x ）-9x． （1）证明：函数f（x）对于定义域内任意x 1 ，x 2 （x 1 ≠x 2 ）： f( x 1 + x 2 2 )＜ f( x 1 )+f( x 2 ) 2 成立． （2）已知△ABC的三个顶点A、B、C都在函数y=f（x）的图象上，且横坐标依次成等差数列，求证：△ABC是钝角三角形，但不可能是等腰三角形．
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举一反三
【单选题】等温等压过程在高温不自发进行而在低温时可自发进行的条件是
A.
△ H<0 ， △ S<0
B.
△ H>0 ， △ S<0
C.
△ H <0 ， △ S>0
D.
△ H >0 ， △ S >0
【多选题】Adverbs in English can be divided into ________.
A.
manner adverbs
B.
small adverbs
C.
big adverbs
D.
sentence-adverbs
【简答题】滑动觉传感器仅检测工业机器人手指与操作物体在切向的（），而不检测接触表面法向的接触或压力。
【单选题】Adverbs like quickly , clumsily , happily are usually termed ________.
A.
manner adverbs
B.
concessive adverbs
C.
degree adverbs
D.
sentence adverbs
【单选题】You should find a _______ chance to explain everything to your mother, because she’s still angry with you.
A.
serious
B.
difficult
C.
proper
D.
normal
【单选题】Adverbs like quickly, clumsily, happily are usually termed ________.
A.
manner adverbs
B.
concessive adverbs
C.
degree adverbs
D.
fake adverbs
【单选题】If he refuses to ______ my plan, I can probably find someone more cooperative.
A.
put up with
B.
fall in with
C.
do away with
D.
get along with
【简答题】滑动觉传感器仅检测指部与操作物体在切向的相对（），而不检测接触表面法向的接触或压力。
【单选题】Adverbs describe or modify _________.
A.
verbs
B.
verbs and adjectives
C.
verbs, adjectives and other adverbs
D.
verbs, adjectives, other adverbs and whole groups of words
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