Please solve math problem?

Question

-l5l-l3-10l=

1/2+4/5-1/4=

3-(2/5+1 1/2)=

(1/5)^3(-25)=

Answer 1

no way seriously those r big numbers

Answer 2

Do you know there is a calculator in your computer?

a) -265

b) Common denominator is 20 so:

10/20 + 16/20 + 5/20 = 31/20

c) Common denominator is 10 so:

3 -(4/10 + 15/10) =

3 -(19/10) =

3 - 1 9/10 =

1 1/10

d) 1/5*1/5*1/5(-25)=

1/125(-25)=

-1/25