3.3. Write the number 100 using four fives and arithmetic signs.

$(4-5$ grade.)



Translate the above text into English, please keep the original text's line breaks and format, and output the translation result directly.
3.3. The two solutions to this problem are given below:

1) $(5+5)(5+5)=100$
2) $(5 \cdot 5-5) \cdot 5=100$