(1)p(x)=f(x)+g(x)=x^3-(k^2-k+1)x^2+5x-2+k^2x^2+kx+1=x^3+(k-1)x^2+(k+5)x-1
显然p（x）在区间（0,3）上可微,∵p(x)在区间（0,3）上不单调,
∴必有a∈（0,3）,使得p'（a）=3a^2+2(k-1)a+(k+5)=0,
解出k=u(a)并注意0