A lot of 9.

17 = 9+9 - (9/9)^9

18 = 9 x sqrt(9) + 9 - 9 - 9
19 = 9 + 9 + (9/9)^9
20 = 9 + 9 + (9 + 9)/9

21 = 9 + 9 + 9 - 9 + sqrt(9)

22 = 9 + 9 + sqrt(9) + (9/9)

23 = 9 x sqrt(9) - sqrt(9) - 9/9
24 = (9 x sqrt(9) - sqrt(9)) x 9/9
25 = 9 x sqrt(9) - sqrt(9) + 9/9
26 = 9^sqrt(9)/sqrt(9) - 9/9
27 = 9*9/sqrt(9) + 9 - 9

You sure about this?

Originally posted by mtthw

26 = 9^sqrt(9)/sqrt(9) - 9/9

28 = 9 x sqrt(9) + (9/9)^9

26 = 9+9+9-9/9

29 = 99/9 + 9 + 9
30 = 9 * sqrt(9) + sqrt(9) * 9/9
31 = 9* sqrt(9)+sqrt(9)+9/9

32 = (99- sqrt(9)) / (9/sqrt(9))
33 = 9 * sqrt(9) + sqrt(9)*sqrt(9) - sqrt(9)
34 = 99/sqrt(9) + 9/9

Originally posted by kbaumen
You sure about this?

Originally posted by mtthw
[b]
26 = 9^sqrt(9)/sqrt(9) - 9/9

[/b]

No. Daft mistake. Try

26 = 9*9/sqrt(9) - 9/9

for what I really meant 🙂

35 = 9 x sqrt(9) + 9 - (9/9)
36 = 9 x sqrt(9) + 9 + 9 - 9
37 = 9 x sqrt(9) + 9 + (9/9)
38 = 9 x sqrt(9) + 99/9
39 = 99/sqrt(9) + 9 - sqrt(9)

40 = (99+sqrt(9)) / sqrt(9) + 9 - sqrt(9)
41 = (99 - sqrt(9)) / sqrt(9) + 9

Edit: 40 is from 6 9s ....oops

40 = (9^sqrt9 - 9) / (9+9)

this was nice!🙄

42 = 9*sqrt(9) +9+ 9 - sqrt(9)

43 = (99 + 9*sqrt(9) + sqrt(9)) / sqrt(9)

i didn't find a way with less than 6 9s
anyone?

Originally posted by alexdino
43 = (99 + 9*sqrt(9) + sqrt(9)) / sqrt(9)

i didn't find a way with less than 6 9s
anyone?

Using the notation n! = n*(n-1)*(n-2)*...
and n!! = n*(n-2)*(n-4)*...

43 = (sqrt(9)!) !! - 9 + sqrt(9) + 9/9

3! = 6
6!! = 48