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a=2-√3,
a-1=2-√3-1=1-√3<0
[(1-2a+a²)/(a-1)]-[√(a²-2a+1)/(a²-a)]
=[(a-1)²/(a-1)]-[√(a-1)²/(a²-a)]
=(a-1)-(1-a)[a/(a-1)]
=(a-1)+(a-1)[a/(a-1)]
=a-1+a
=2a-1
=2*(2-√3)-1
=4-2√3-1
=3-2√3
a-1=2-√3-1=1-√3<0
[(1-2a+a²)/(a-1)]-[√(a²-2a+1)/(a²-a)]
=[(a-1)²/(a-1)]-[√(a-1)²/(a²-a)]
=(a-1)-(1-a)[a/(a-1)]
=(a-1)+(a-1)[a/(a-1)]
=a-1+a
=2a-1
=2*(2-√3)-1
=4-2√3-1
=3-2√3
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