(a+b+c)(ab+bc+ca)-abc の解き方を教えてください
間違ってたらすみません🙏
ありがとうございます
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![基本例題の[2]についてです。ここの条件ですが、
a/3<=1<=4a/3とありますが4a... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810404/thumb_l_webp_70236300-B387-4A8D-A246-76C58E626EEE.webp?Expires=1787911825&Signature=QKYW3w6p3-b1z8rnDv4WBNQEqHfpCiI-rpTOPvZ4dU-aXp1SxqvVzMCE-N8aChwQf3eR8V4xyuAAXEZzG2cYd1FO0578g29xJmg2F0RkPyBK2QOeYd9RO8W1mO~lR8VzFUH~GZ7BpxQ6qJaOmLHzgYLU5dwtpLl2BCRoHx2STQRxv43HrH-aragGnq-KxSiV68Wk5tl7C-HKBi5SFjR4dgoZbaZcsl9hL6Ac5XJuVnCi5YfjFzImlRIhxwaz3VwhGpQlnsBoWKCmM12ndrw6i7IYhne8WNr8mCzmISrTd2pTS7aeouj4wOHjBznSJ-YoOEWBpGsKTfeVEl~ECZt0QA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787911825&Signature=NiRffKd~bsFm9xJ4nH8Uaoc8SzKxFpWqYRr9N7eVsBlTiYw06XHsg1dk~V68hIwIaWHxAVkmA02scp5dijrZNhU50CJS4-rNojklU8jL1YQHQpqLtKgtVrMp4rh5cShYw-EIUaFqTqxK7Vm2jv~umqQXnzKn4WQhyJE2v-AA3SOGFkQevqhFomShAAaLRbS1v3K2cMSROBNMFzUF-Iv1-Wyzf--qsyQa84sBTyhwhCjfdnelMD~0VDIch0H-96nUFd3gWxKdKUeFFYFokbi0EQWXrkd--y0NNe62SKxhfPM5MHjk~jshDxc3nqcWIt04QD9CFuU0Snm0AZACVExH-g__&Key-Pair-Id=K2W722D70GJS8W)
ありがとうございます