当a=1/√3+2时,求(a²-a-6)/(a+2)-√(a²-2a+1)/(a²-a)的值.
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当a=1/√3+2时,求(a²-a-6)/(a+2)-√(a²-2a+1)/(a²-a)的值.
当a=1/√3+2时,求(a²-a-6)/(a+2)-√(a²-2a+1)/(a²-a)的值.
当a=1/√3+2时,求(a²-a-6)/(a+2)-√(a²-2a+1)/(a²-a)的值.
a=1/(√3+2)
=(2-√3)/(√3+2)(2-√3)
=(2-√3)/(4-3)
=2-√3
a-1=1-√3