设服从参数为2的泊松分布，则 |X-2|leqslant dfrac {sqrt {2)}(2)} =( ) () |X-2|leqslant dfrac {sqrt {2)}(2)} =( ) () |X-2|leqslant dfrac {sqrt {2)}(2)} =( ) () |X-2|leqslant dfrac {sqrt {2)}(2)} =( ) () |X-2|leqslant dfrac {sqrt {2)}(2)} =( ) ()

lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}=..

设D: leqslant (x)^2+(y)^2, =dfrac (dxdy)(sqrt {{x)^2+(y)^2}}=()leqslant yleqslant

（21）lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}（21）

求下列极限lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}求下列极限

函数(x)=dfrac (1)(x-2)的间断点是(x)=dfrac (1)(x-2)(x)=dfrac (1)(x-2)、(x)=dfrac (1)(x-2)

.求下列极限:-|||-(6) lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)} ;

[题目]-|||-(int )_(2)^+infty dfrac (dx)((x+7)sqrt {x-2)}= __

求极限lim _(xarrow 2)dfrac (x-2)(sqrt {2x-3)-1}-|||-__.求极限.

1.设 approx N(2,18), 若 Y=(B) ),则 approx N(0,1).-|||-(A) dfrac (x-2)(18): (B) dfra

试求下列极限:-|||-lim _(xarrow 2)(sqrt (3-x)+ln dfrac (x)(2))dfrac (1)({sin )^2(x-2)}