Let f(x)=25x^2+kx+2,where k is real.(a) If f(x)=0 has equal roots,find the value(s) of k,leaving your answer(s) in simplest surd form.(3marks)(b) If a is the smaller positive root of the quadratic equation f(x)=0,and one root is half of the other,exp

有f(x)=kx^2+3x+1,求当x≥1,f(x) 设函数f(x)=kx^2-kx-6+k若对于x∈【1,2】,f(x) 设f(x,y)=e^(x^2+y^2) 则 f（x,kx）=? 已知函数f(x)=x^2+kx+1/x^2+x+1最小值怎么求 随机变量X的概率密度为f(x)=kx^2x,x 求常数k,使得函数f(x)={ (1+kx)^1/x (x>o) 2 (x 讨论函数f(x)的单调性：（1）f(x)=kx+b （2)f(x)=k/x f(x)=xe^kx 设函数f(x)=kx^2-kx-6+k.若对以k∈[-2,2],f(x) 设函数f(x)=kx^2-kx-6+k,若对于k属于【-2,2】,f(x) 设函数f(x)=kx²-kx-6+k ...若对于k∈[-2,2],f(x) 设函数f(x)=kx²-kx-6+k ...若对于k∈[-2,2],f(x) Let f(x)=25x^2+kx+2,where k is real.(a) If f(x)=0 has equal roots,find the value(s) of k,leaving your answer(s) in simplest surd form.(3marks)(b) If a is the smaller positive root of the quadratic equation f(x)=0,and one root is half of the other,exp （1）已知函数f(x ) x+2 (x>=2) 若f(f(f(k)))=25/4,求kx^2 (0 求f(x)=kx^2+kx+1在区间【0,1】上的值域 设函数f(x)=kx+2,不等式[f(x)]^2不解第二问,请指教! 设函数F(x)=kx+2,不等式[F(x)的绝对值] (求常数k,使得函数f(x)={(1+kx) （x>0） 2 (x