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Questions about mathematical riddles.
1. passenger information-multiplication (passenger rule)

2. Separable

3. Countdown from the last number (countdown homonym)

4. Ten cents-spare corner ("Ten cents" is a dime and the remaining dime is a spare corner)

5. Relative vertex angle

6. Line segment (beard is like a line, shaving will break the line, so it is a line segment (broken))

7. Parallel

8. Absolute value

9. Negative numbers