初三数学二次根式第14题
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初三数学二次根式第14题
解
(1/x+1/y)×2/(x+y)
=[y/xy+x/xy]×2/(x+y)
=(x+y)/xy×2/(x+y)
=2/xy
=2/(2√3)
=√3/3
初三数学二次根式第14题
解
(1/x+1/y)×2/(x+y)
=[y/xy+x/xy]×2/(x+y)
=(x+y)/xy×2/(x+y)
=2/xy
=2/(2√3)
=√3/3