a=√3 2,b=√3-2 求(a²-ab+b²)/(a b)
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2017-04-18
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a=√3+2,b=√3-2,
(a²握塌掘-ab+b²)/(衫誉a+b)
=(a²+2ab+b²-3ab)段核/(a+b)
=(a+b)²/(a+b)-3ab/(a+b)
=(a+b)-3ab/(a+b)
=2√3-3×(-1)/(2√3)
=2√3+√3/2
=5√3/2
(a²握塌掘-ab+b²)/(衫誉a+b)
=(a²+2ab+b²-3ab)段核/(a+b)
=(a+b)²/(a+b)-3ab/(a+b)
=(a+b)-3ab/(a+b)
=2√3-3×(-1)/(2√3)
=2√3+√3/2
=5√3/2
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