计算:(1)(sqrt(5))2;(2)(-sqrt(0.2))2;(3)(sqrt((2)/(7)))2;(4)(5sqrt(5))2;(5)sqrt((-1
已知x=(sqrt(3)-sqrt(2))/(sqrt(3)+sqrt(2)),y=(sqrt(3)+sqrt(2))/(sqrt(3)-sqrt(2)),求3
-3sqrt (2) C. -2sqrt (3) D. -1
2.根式计算.-|||-(1) sqrt (dfrac {4)(25)} ;-|||-(2) sqrt ({11)^2+((4sqrt {3))}^2}-|||
(1) int dfrac (3sqrt {x)}(x(sqrt {x)+sqrt [3](x))}dx
lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}=..
(21)lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)}(21)
.求下列极限:-|||-(6) lim _(xarrow 4)dfrac (sqrt {2x+1)-3}(sqrt {x-2)-sqrt (2)} ;
求下列极限:-|||-(6) lim _(xarrow +infty )(x)^dfrac (3{2)}(sqrt (x+2)-2sqrt (x+1)+sqrt
求下列函数的定义域:(1)=sqrt (3x+2);(2)=sqrt (3x+2);(3)=sqrt (3x+2);(4)=sqrt (3x+2).求下列函数的