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2n-根號(4n^2-kn+3)=根號(4n^2)-根號(4n^2-kn+3)=4n^2-(4n^2-kn+3)--------------------------------=(上下同時乘以根號(4n^2)+根號(4n^2+kn+3))根號(4n^2)+根號(4n^2-kn+3)kn-3--------------------------------…
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