这道题有谁会做的,拍照发过程。 20
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(a²-2a+1)/(a-1)+√(a²-2a+1)/(a²-a) a=√48-6
=(a-1)²/(a-1)+√(a-1)²/[a(a-1)]
=a-1+(a-1)/[a(a-1)]
=a-1+1/a
=√48-6-1+1/(√48-6)
=√48-7+(√48+6)/[(√48-6)(√48+6)]
=√48-7+(4√3+6)/(48-36)
=4√3-7+(2√3+3)/6
=(24√3-42+2√3+3)/6
=(26√3-39)/6
=(a-1)²/(a-1)+√(a-1)²/[a(a-1)]
=a-1+(a-1)/[a(a-1)]
=a-1+1/a
=√48-6-1+1/(√48-6)
=√48-7+(√48+6)/[(√48-6)(√48+6)]
=√48-7+(4√3+6)/(48-36)
=4√3-7+(2√3+3)/6
=(24√3-42+2√3+3)/6
=(26√3-39)/6
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