Question

I need to use four 7's to get numbers 1-20... HELP!

Answer 1

1=7/7 +7-7

2=7/7+7/7
3=(7+7+7)/7
4=77/7-7
5=7-(7+7)/7
6=√(7·7)-7/7
7=√(7·7)+7-7
8=√(7·7)+7/7
9=7+(7+7)/7
10=(77-7)/7
11=7/.7+7/7
12=(77+7)/7
13=7+7-7/7
14=(7+7)·(7/7)
15=7+7+7/7
16=7/(.7periodic)+√(7·7)
17=7/.7+raiz(7·7)
18=77/7+7
19=7/(.7periodic)+7/.7
20=7/.7+7/.7

Answer 2

http://answers.yahoo.com/question/index?qid=20071207133255AAS64nr (sorry the format here didnt pasted well)