先化简,再求值x-4/(x²-1)除以x²-3x-4/(x²+2x+1)+1/(x-1),其中x=2倍根号3+1

问题描述:

先化简,再求值x-4/(x²-1)除以x²-3x-4/(x²+2x+1)+1/(x-1),其中x=2倍根号3+1

您好: x-4/(x²-1)除以x²-3x-4/(x²+2x+1)+1/(x-1)=(x-4)/(x+1)(x-1)÷(x+1)(x-4)/(x+1)²+1/(x-1)=1/(x-1)+1/(x-1)=2/(x-1)=2/(2√3+1-1)=2/2√3=1/√3=√3/3如果本题有什么不明白可...