请大神帮忙解一下这道题
1个回答
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解:
lim [√(x²+1)-√(x²-1)]
x→∞
=lim [√(x²+1)-√(x²-1)][√陆银(x²+1)+√(x²-1)]/[√(x²搏凳+1)+√(x²早银宴-1)]
x→∞
=lim [(x²+1)-(x²-1)]/[√(x²+1)+√(x²-1)]
x→∞
=lim 2/[√(x²+1)+√(x²-1)]
x→∞
=lim (2/x)/[√(1+ 1/x²)+√(1- 1/x²)]
x→∞
=0/[√1+0)+√(1-0)]
=0/2
=0
lim [√(x²+1)-√(x²-1)]
x→∞
=lim [√(x²+1)-√(x²-1)][√陆银(x²+1)+√(x²-1)]/[√(x²搏凳+1)+√(x²早银宴-1)]
x→∞
=lim [(x²+1)-(x²-1)]/[√(x²+1)+√(x²-1)]
x→∞
=lim 2/[√(x²+1)+√(x²-1)]
x→∞
=lim (2/x)/[√(1+ 1/x²)+√(1- 1/x²)]
x→∞
=0/[√1+0)+√(1-0)]
=0/2
=0
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