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1、下列各式中哪些一定是二次根式？

2、求下列二次根式中字母x的取值范围：

3、在实数范围内因式分解：

4、化简：

5、下列根式中，最简二次根式有__个.

6.利用平方差公式的计算.

7、若 ，

8、化简二次根式：

9、化简求值：

10、已知 ，

11.分母有理化后进行计算:

12.利用分母有理化的计算来比较大小:

13.关于整数部分、小数部分的计算题:

14.从 中随机抽取一个根式与 是同类二次根式 的概率是______

15.如图:小正方形的边长为1.连接小正方形的三个顶点可得三角形ABC,则AC边上的高是_____

A

C

B

16.如图:DB:AB=1:2,AB=5,求半径?

D

C

O

A

B

15.下列计算正确的是

(A)

(B)

(C)

(D)

(E)

(F)

19 已知：菱形ABCD的对角线BD＝2，∠A＝30°, 求菱形ABCD的面积．