A.20!
B.0
C.∞
D.-20!
[单选题]设f(x)=x(x-1)(x-2),则方程f′(x)=0的实根个数是()。A.3B.2C.1D.0
[单选题]设f(x)=x(x-1)(x-2),则方程f′(x)=0的实根个数是()。A.3B.2C.1D.0
[单选题]设f(x)=x(x-1)(x-2),则方程f′(x)=0的实根个数是()。A.3B.2C.1D.0
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有()个实根。A.2017B.2018C.2019D.2020
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有()个实根。A.2017B.2018C.2019D.2020
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有()个实根。A.2017B.2018C.2019D.2020
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有( )个实根。A.2017B.2018C.2019D.2020
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有( )个实根。A.2017B.2018C.2019D.2020
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有( )个实根。A.2017B.2018C.2019D.2020
[单选题]设f(x)=(x-1)(x-2)…(x-2019),则方程f′(x)=0有( )个实根。A.2017B.2018C.2019D.2020