A.n
B.-27n
C.3n
D.-3n
[单选题]A.nB.-27nC.3nD.-3n
[单选题]A.nB.-27nC.3nD.-3n
[单选题]A.nB.-27nC.3nD.-3n
[单选题]A.1cmB.2cmC.2.5cmD.3cmE.4cm
[单选题]A.0B.1/2C.1/4D.-1/2E.2010
[单选题]A.③④B.①③C.①②D.②④E.②③
[单选题]A.9/10B.4C.-4D.13/16E.无法确定
[单选题]A.1,3B.1,2C.-1,3D.-1,2E.-1,-3