Find three ways of forming the number 100 using 3,3,5,7

Question

As it says in the title.

Rules:

1. anything not explicitly allowed is forbidden.
2. use 3, 3, 5, 7 and multiplication, division, sum, difference, unary minus, and exponentiation in any order. Parentheses are allowed for grouping.
3. factorials, square roots, concatenation and decimal points are forbidden.
4. lateral thinking is forbidden.
5. must give three distinct expressions. No partial answers, please.

Example:

If it were 3, 5, 5, 7 instead of 3, 3, 5, 7 then you could do

1. (3+7)x(5+5)
2. (7-3)x5x5
3. 3x5x7-5

Clarification: What is distinct? Or rather, what is not distinct:

5x(-3+7)x5      -   same as 2.
(-3)x(-5)x7-5   -   same as 3.

Attribution: conceived by myself

Answer 1

First Way

$100 = 7^3 - 3^5$

Second Way

$100 = (3^3- 7)\times 5$

Third Way

$100 = (7+3)^{(5-3)}$