A.1
B.-1
C.k
D.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1/k
[单选题]已知为某函数的全微分,则a等于( )。A.-1B.0C.1D.2
[单选题]设z=exey,则等于( )。[2014年真题]A.B.C.exeyD.exey+y
[单选题]设z=exey,则等于( )。[2014年真题]A.B.C.exeyD.exey+y
[单选题]设,则( )。[2010年真题]A.f(x)为偶函数,值域为(-1,1)B.f(x)为奇函数,值域为(-∞,0)C.f(x)为奇函数,值域为(-1,