1,

`ul(11)`,12,`ul(13)`,14, 15, 16, `ul(17)`, 18, `ul(19)`, 20, 21, 22, `ul(23)`, 24, 25, 26, 27, 28, `ul(29)`.

2,

`15/7` = `2 1/7`

`20/3` = `6 2/3`

`31/5` = `6 1/5`

3,

a,

`5/4` = 1,25

`14/3` = `4.dot(3)`

`23/12` = `1.91dot(6)`

b,

2,35 = `235/100` = `47/20`

4,(6) = `14/3`

1,2(4) = `112/90`

4,

3 `lt` `24/7` `lt` 4

8 `lt` `42/5` `lt` 9

-6 `lt` -5,23 `lt` -5

13 `lt` 13,85 `lt` 14

5,

63 = `3*3*7` = `3^2*7`

630 = `2*3*3*5*7` = `2*3^2*5*7`

6300 = `2*2*3*3*5*5*7` = `2^2*3^2*5^2*7`


6,

2853 = `2*10^3+8*10^2+5*10+3`

308 = `3*10^2+8`

41,5 = `4*10+1+5*10^(-1)`

28,06 = `2*10+8+6*10^(-2)`

3,619 = `3+6*10^(-1)+10^(-2)+9*10^(-3)`

43,28 = `4*10+3+2*10^(-1)+8*10^(-2)`.