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5×根号2+根号8-7×根号18
人气:193 ℃ 时间:2019-12-27 08:13:00
解答
5×根号2+根号8-7×根号18
=5×根号2+2×根号2-7×3×根号2
=(5+2-21)×根号2
=-14×根号2
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