k²+4根号2k+1大于零 k²+4根号2k+1大于零

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k²+4根号2k+1大于零 k²+4根号2k+1大于零

k²+4根号2k+1大于零 k²+4根号2k+1大于零
k²+4根号2k+1大于零
k²+4根号2k+1大于零

k²+4根号2k+1大于零 k²+4根号2k+1大于零
K^2+4根号2+1>0,则
(K+2根号2)^2-7>0,调整后:K属于(根号7-2根号2,正无穷)或(负无穷,-根号7-2根号2)