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7+6+5+4+3+2+1+(8x9)=100

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To achieve the numbers from 1 to 9 while keeping them in the same order and using addition, subtraction, multiplication, and division, we can combine mathematical operations creatively. Here's one way to do it:

1. \(1 = 1\)

2. \(2 = (1 + 1)\)

3. \(3 = ((1 + 1) + 1)\)

4. \(4 = (((1 + 1) + 1) + 1)\)

5. \(5 = ((((1 + 1) + 1) + 1) + 1)\)

6. \(6 = ((((1 + 1) + 1) * 1) * 1)\)

7. \(7 = (((((1 + 1) + 1) + 1) * 1) / 1)\)

8. \(8 = ((((((1 + 1) + 1) + 1) * 1) + 1) - 1)\)

9. \(9 = ((((((1 + 1) + 1) + 1) * 1) + 1) / 1)\)

So, using the specified operations, the numbers from 1 to 9 can be obtained while keeping them in the same order.
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Here is a solution to convert the numbers 1 to 9 to 100 without changing their order: (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 \times 9 = 100)
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