先化简再求值 a的平方-1/a-1 -根号下a的平方-2a+1/a的平台-1 其中a=1/2+根号3
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a的平方-1/a-1 -根号下a的平方-2a+1/a的平台-1 其中a=1/2+根号3=2-√3
=(a-1)(a+1)/(a-1)-√(a-1)²/(a-1)(a+1)
=a+1-1/(a+1)
=(a²+2a+1-1)/(a+1)
=a(a+2)/(a+1)
=(2-√3)(2-√3+2)/(2-√3+1)
=(8-6√3+3)/(3-√3)
=(11-6√3)(3+√3)/(3-√3)(3+√3)
=(33-18√3+11√3-18)/6
=(15-7√3)/6
=(a-1)(a+1)/(a-1)-√(a-1)²/(a-1)(a+1)
=a+1-1/(a+1)
=(a²+2a+1-1)/(a+1)
=a(a+2)/(a+1)
=(2-√3)(2-√3+2)/(2-√3+1)
=(8-6√3+3)/(3-√3)
=(11-6√3)(3+√3)/(3-√3)(3+√3)
=(33-18√3+11√3-18)/6
=(15-7√3)/6
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