x÷(x+1)(x-1)÷(1-1÷x+1)
=x÷(x^2-1)÷(2-1/x)
=x(2-1/x)/(x^2-1)
=(2x-1)/(x^2-1)
将x=√3 +1代入
(2x-1)/(x^2-1)
=[2(√3 +1)-1]/[(√3 +1)^2-1]
=(2√3 +1)/(3+4√3)
【如果】
x÷[(x+1)(x-1)]÷[1-1/(x+1)]
原式
=x/[(x+1)(x-1)]÷x/(x+1)
=1/(x-1)
=1/√3
=(1/3)√3
如本站内容“对您有用”,欢迎随意打赏,让我们持续更新!