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【简答题】
已知函数 f(x)= a x + x-2 x+1 （a＞1）， 求证：（1）函数f（x）在（-1，+∞）上为增函数； （2）方程f（x）=0没有负数根．
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举一反三
【简答题】[A] consider [B] to consider [C] considering [D] considered
【单选题】You should ______ it carefully before ______ a composition. [ ]
A.
consider, write
B.
consider, writing
C.
considering, writing
【单选题】If you have a holiday, why not ________ on a trip?
A.
consider to go
B.
to consider to go
C.
consider going
D.
considering going
【单选题】Why not _______ the Great Wall? [ ]
A.
consider visit
B.
consider visiting
C.
considering visiting
D.
consider to visit
【单选题】Why not _ Singapore? I think it's the place to travel to. [ ]
A.
consider to visit
B.
consider visiting
C.
to consider visiting
【单选题】People()foxes()clever but sly animals.
A.
consider…to be
B.
consider…as
C.
Consider…X
【单选题】Why not ________ the word in a dictionary ?
A.
consider looking up
B.
consider looking at
C.
consider looking for
D.
to consider to look up
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