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(2根号4加2根号3)减(根号21减12根号3)等于.
人气:395 ℃ 时间:2020-05-01 14:24:50
解答
(2根号4加2根号3)减(根号21减12根号3)
=2*根[(根3+1)^2]-根[(3-2根3)^2]
=2(根3+1)-(2根3-3)
=2根3+2-2根3+3
=5
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