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问题: 代数小小问题

(5+2倍根号3)(5-2倍根号3)-(2倍根号7-1)^2=?

解答:

(5+2倍根号3)(5-2倍根号3)-(2倍根号7-1)^2
=(25-12)-(28-4倍根号7+1)
=4倍根号7-16

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