1 2 3 4 5 6 7 8 9 only + or - is allowed. How to get 100? It can be seen as: 12, 23, etc | Math enthusiast | Mathematical art

1 2 3 4 5 6 7 8 9 only + or - is allowed. How to get 100? It can be seen as: 12, 23, etc

123-4-5-6-7+8-9=100
123+45-67+8-9=100
As for how I think of it, I just want to get 123 first, and then think about how to get 23 from 4, 5, 6, 7, 8 and 9. There should be many ways. I'll think about it when I have time!

Find the regular number 3 8 10 18 17 28

3 8 10 18 17 28 24 38 31 48
3+7=10 10+7=17 17+7=24 24+7=31
8+10=18 18+10=28 28+10=38 38+10=48

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