设f(x)=(x-1)(x-2)(x-3),则方程f′(x)=0在(0,3)内的根的个数为(56)。A.1B.2C.3D.4
设f(x)=x(x-1)(x-2),则方程的实根个数是( )。A、 3B、 2C、 1D、 0
设f(x-1) =x2,则f(x+1)等于:A. (x-2)2 B. (x+2)2 C. x2-22 D.x2+22
设f(x)函数在[0,+∞)上连续,则f(x)是:A. xe-xB.xe-x-ex-1 C. ex-2D. (x-1)e-x
设f(x)是周期为4的可导奇函数,且f'(x)=2(x-1),x∈[0,2],则f(7)=________.
设f(x)函数在[0,+∞)上连续,且满足,则f(x)是:A. xe-xB. xe-x-ex-1C. ex-2D. (x-1)e-x
递归函数f(x,y)定义如下: f(x,y)=f(x-1,y)+f(x,y-1) 当x>0且y>0 f(x,y)=x+y 否则 则f(2,1)的值是()。A.1B.2C.3D.4
设f(x)是(-∞,∞)是的奇函数,f(x+2)=-f(x),当0≤x≤1时,f(x)=x,则f(7.5)等于______。A.0.5B.-0.5C.1.5D.-1.5
【单选题】设f(x)=x(x-1)(x-2)……(x-99)(x-100),则f '(0)等于A.-100;B.0;C.100;D.100!