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減法 ( 引き算 ). -. =. 9. 9. 18. -. =. 8. 9. 17. -. =. 7. 9. 16. -. =. 6. 9. 15. -. =. 5. 9. 14. -. =. 4. 9. 13. -. =. 3. 9. 12. -. =. 2. 9. 11. -. =. 1. 9. 10. -. =. 17. 9. 8. -. =. 16. 8. 8. -. =. 15. 7. 8. -. =. 14. 6. 8. -. =. 13. - PowerPoint PPT Presentation
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