請問有效數字遇到算式是四則運算的，該怎麼辦？是要先取有效還是算到最後一步再取有效？
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เมื่อดูคำถามนี้แล้ว ก็จะเจอคำถามเหล่านี้ด้วย😉
![請問13.38的速率式如何求？謝謝~
答案：k2(k1/k-1)[A]
普化 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1324012/thumb_l_webp_16525374741740.webp?Expires=1774742315&Signature=dtWSCmIYKSXBulXEN5JvSZ~pMhRVo-BweNiqvNhnsbJjZbrJjMQ1hLLJHDW6TlctTr17jGHuJw1Y88gV44KFiNQcA85Zs0Q2qjUzQVfR85CTrMP~bZPIAwgwKgMwRiAKa5iDbcZBGnpTg1yGnVyJm8BL86kcPEiXlYWvE3AZI2CJPzT1CVE103VNTsGjiW77bGxnIg5PY8IJcDclqLXgFdfxNowz77VrvPd-MD6e26m9yLlnF5qn9Qdq~JQZ2-b3p4eNUjZG8HrKSCWIbxuLrKWjUNqbBSV3IdhfkJawxTDX38DBJhTVQQglkqDR6G50dq5ND543VYDvnUhHlKdcZA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1774742315&Signature=XC9vinYTWTde8iaXULXFrXTMEhZn~tCfzrPo1w8miyu7nbeMs39CfoNZS8cRHdqkQt~uslNWeoGDWNuQrucVtHHz9lJk4V8mp78PsLv8gCjnE4l1O9vj~chF9BEfqFaMa6-j0hpiBzOYlFbFXuuQ6Mlwez1xO9tSP5wQp1s7vkOJTwpqIHlUk8ueAg1NzdeseaBvVa64D76naFXHA7YPjVpPVN3pSPt9FDips-LPdKueT3LeVAJQTLvyoUQXpSWpsRTb9nLM7Tj8SpKtxtqE2bgG6ARHkKuotT-vc0~~a6ZktuKXC9tNIV-gTnuHFr041d0HfqGDCkMkzEKmqoQQ5g__&Key-Pair-Id=K2W722D70GJS8W)
