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![請問這題怎麼算？
怎麼求F（合力）
*答案：[(kQq)÷9]×√2↙︎ - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1680753/thumb_l_webp_17247667947220.webp?Expires=1749334347&Signature=N5FPJnPO2nQP3cdnAPCvZaEduWa7EtBYcLzh01viPSWNzW-nKJfmE0YYSMbOksFmUpv29Y6zWmUtRn9-j47TUhXYmk2aNutSYFwqmlfebZixE3-RdhvgPjIEjJF8VbJF439inToqe3~zj~GXiVYAW67M8XjTxwG58KBZsWBFhxfBPy96pShPZ6-85GQKnM3FwayXQEReDmmDoyp2aLMJyHJ-16YX6hWGaGiSWLOjQFbDniR4H1LbxoEjPiwv1A7-UOVBRt~413bQc~S4iSFE3ddvnHTEqgQ~LeyhoeFgxjUQ5qBKus1qi5cd5glHcEmlkMswJE-grH4c37FZ7RdPJw__&Key-Pair-Id=K2W722D70GJS8W&Expires=1749334347&Signature=EuIuXaUvWL1~uYxsHW0tUUV4RXjAGYGj5zK6KjpjGc76pBF6HFgxn~jltev11Ehsq5IaYqWABqde1xbS3J7MSSJ3aI9JHXibyfXB83yh8Wk37FgfCuD4u4TCft2eQczhc8ujPyMnhEEkjNLM-nPQ4h-FRNHTDM-O-C2e3WHedfT3oUESDQBVtk~ONyCsOt9cV~y71kyHTpoAz-nxl4naUSsorU2moPlhuY10HUh49ONJG-eC-opKGuBH9pYpOUipg~2KUUkNPJwJ5MP2jWmPNpflDHWLhd-u8w~gYp8EzFNdCP12iiqyvzOSdI3Zx8~pGb0Bhg6hAp95UeKhlrEZlg__&Key-Pair-Id=K2W722D70GJS8W)
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