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Best Answer Jim Bob says
Found three more expressions:
(1+2+3+4)x((56/7)/8 + 9) = 100,
(((1+2)^3)x4 - 56/7)x(-8+9) = 100, and
123 - 45 - 67 + 89 = 100.
It was a nice challenge.
Now that I think about it, having the digits go in order would have made a more challenging math brain teaser. Nice work!
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Well, you can always try to challenge yourself as you just did by restricting yourself to a smaller set of operations.