1) 5*5*5-5*5 = 100

2) 5*(5+5+5+5) = 100

3) (5*5-5)*sqrt(5*5) = 100

4) (5-5/5)*5*5 = 100

5) (5+5)^[(5+5)/5] = 100

6) 5!-[5*(5-5/5)] = 100

7) 5!-5*sqrt(5*5)+5 = 100

8) 5!-5*5+sqrt(5*5) = 100

9) [sqrt(5*5)]!-5*5+5 = 100

10) sqrt(5*5)*(5*5-5) = 100

11) 5*[5*sqrt(5*5)-5] = 100

12) 5*[5*5-sqrt(5*5)] = 100