A

B

C

D

E

$3\sqrt{2}$

$2\sqrt{2}$

$3\sqrt{3}$

$2\sqrt{3}$

3

4

5

6

$\frac{3}{2}$

$\frac{4}{3}$

$\frac{5}{4}$

$\frac{6}{5}$

$\frac{1}{4}$

$\frac{2}{5}$

$\frac{4}{7}$

$\frac{5}{9}$

$\frac{2+b+ab}{4+b}$

$\frac{a+ab+b}{2+ab}$

$\frac{ab+2a+1}{1+a+b}$

$\frac{ab+1+b}{2+ab}$

$-\frac{1}{2}<x<\frac{1}{2}\ or\ x>\frac{5}{3},x\ne0$

$-\frac{1}{3}<x<\frac{1}{2}\ or\ x>5\ ,\ x\ne0$

$-2<x<2\ or\ x>5\ ,x\ne0$

$x>5\ or\ x<-1\ ,x\ne0$

$2\sqrt{2}$

$3\sqrt{3}$

$3\sqrt{2}$

$2\sqrt{3}$

16

17

18

19

20

30

40

50