回复：My daughter's 3rd grade math. Need help...
绿苹果园
2010-01-17 23:58:46
( reads)
Why 3rd grade math? Maybe because the "only" operator needed here is addition:
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
5 10 10 5
15 20 15
35 35
70
JIAYANGGUIZI2
2010-01-18 08:13:58回复：回复：My daughter's 3rd grade math. Need help...