A.
B.
C.
D.
[单选题]( ).A.B.C.D.
[判断题]A.对B.错
[单选题]A.11.94B.7.26C.5.97D.3.63E.2.34
[问答题](m 查看答案
[单选题]A.-1B.1C.2a-1D.1-2aE.1+2a