DFHTJHSD
幼苗
共回答了18个问题采纳率:88.9% 举报
lim(x→4)[(√2x+1)-3]/(√(x-2)-√2)
=lim(x→4)[(√2x+1)-3][(√2x+1)+3](√(x-2)+√2)/(√(x-2)-√2)(√(x-2)+√2)[(√2x+1)+3]
=lim(x→4)(2x-8)(√(x-2)+√2)/(x-4)[(√2x+1)+3]
=lim(x→4)2(√(x-2)+√2)/[(√2x+1)+3]
=2(√2+√2)/[(√9)+3]
=2√2/3
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1年前
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