x→1时,1/(x^2-4x+3)→∞,x=1是瑕点.1/(x^2-4x+3)=1/2×[1/(x-3)-1/(x-1)],原函数是1/2×ln|(x-3)/(x-1)|∫(0→t) 1/(x^2-4x+3)dx=1/2×ln|(t-3)/(t-1)|-1/2×ln3t→1-时,∫(0→t) 1/(x^2-4x+3)dx→∞,所以∫(0→1) 1/(x^2-4x+3)dx发散所以,∫(0→2) 1/(x^2-4x+3)dx发散。