2015经济类联考数学模拟一（16-20）
16.若http://file.koolearn.com/2014/0118/20140118125419531.gif
，则
http://file.koolearn.com/2014/0118/20140118125421859.gif
的值为()
A.7 B. 8 C.9 D.10 E.12
17.若
http://file.koolearn.com/2014/0118/20140118125422237.gif
，则
http://file.koolearn.com/2014/0118/20140118125422354.gif
( )
A.
http://file.koolearn.com/2014/0118/20140118125423219.gif
B.
http://file.koolearn.com/2014/0118/20140118125423984.gif
C.
http://file.koolearn.com/2014/0118/20140118125424217.gif
D.4 E.2
18.已知
http://file.koolearn.com/2014/0118/20140118125424590.gif
，则多项式
http://file.koolearn.com/2014/0118/20140118125424507.gif
的值为( )
A.1 B. 2 C.-1 D.0 E.1或-1
19.若
http://file.koolearn.com/2014/0118/20140118125425448.gif
，则
http://file.koolearn.com/2014/0118/20140118125425404.gif
的值是( )
A.-1 B. 0 C.1 D.2 E.3
20.已知
http://file.koolearn.com/2014/0118/20140118125426459.gif
，
http://file.koolearn.com/2014/0118/20140118125427525.gif
，则
http://file.koolearn.com/2014/0118/20140118125427686.gif
的值
A.大于零 B.等于零 C.大于等于零 D.小于零 E.小于等于零
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