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题型:单选题 题类:常考题 难易度:普通
分母有理化++++++++++++
化简: ={#blank#}1{#/blank#}.
={#blank#}1{#/blank#}; ={#blank#}2{#/blank#}; ={#blank#}3{#/blank#}.
= = = =
= = =
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