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求lim _(xarrow +infty )x(sqrt ({x)^2+1}-x)求
已知lim _(xarrow +infty )(x)^a[ sqrt ({x)^2+1}+sqrt ({x)^2-1}-2x] =bneq 0 x]=b≠0，则
2.求极限 lim _(xarrow +infty )arcsin dfrac (x)(sqrt {{x)^2+1}+x}
6、极限 lim _(xarrow +infty )(sqrt ({x)^2+x}-sqrt ({x)^2+1})= () 。(较难)-|||-A、0 B、 d
求lim _(xarrow infty )dfrac (ln (x+sqrt {{x)^2+1)}-ln (x+sqrt ({x)^2-1})}({({e)^d
lim _(xarrow infty )xsin dfrac (2x)({x)^2+1}=________.________.
(3) lim _(xarrow infty )xsin dfrac (x)(2{x)^2+1} ,
) lim _(xarrow +infty )(sqrt ({x)^2+x}-sqrt ({x)^2-x});
) lim _(xarrow +infty )(sqrt ({x)^2+x}-sqrt ({x)^2-x});
lim _(xarrow +infty )(sqrt ({x)^2+2x}-x);;