
初二数学,已知X=根号3+1,Y=根号3-1,求代数式x的平方-y的平方分之x的平方-xy+y的平方 10
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(x²-xy+y²)/(x²-y²)
=(x²-2xy+y²+xy)/[(x-y)(x+y)]
=[(x-y)²+xy]/(x-y)(x+y)]
=[(√3+1-√3+1)²+(√3+1)(√3-1)]/[(√3+1-√3+1)(√3+1+√3-1)]
=(4+3-1)/(4√3)
=3/(2√3)
=(√3)/2
=(x²-2xy+y²+xy)/[(x-y)(x+y)]
=[(x-y)²+xy]/(x-y)(x+y)]
=[(√3+1-√3+1)²+(√3+1)(√3-1)]/[(√3+1-√3+1)(√3+1+√3-1)]
=(4+3-1)/(4√3)
=3/(2√3)
=(√3)/2
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这个是错的
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