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a^3+b^3+c^3
=(a+b+c)(a^2+b^2+c^2-ab-bc-ca)+3abc
この公式でやってみては？因数分解は出来ないと思いますが、、
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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=1787749560&Signature=Xa-BrB8xlD9QG-5PaiRSLb~56C8SbBJcCFVx6sJiigDzpCS1LXWTYhm8jqBKdg0~UeAGftJww1~RHPnl9uGDX2xmPaBB46U0HKzpq~gIV2s-s9z8S4DPzH3vrCX8zWY4m25Oh8riqT2tbw~48163CXPV1vU14~tUb9DFFhpfnT9FpGzJ3IUNsollhNMZP~B4WbsflAbYYEae5en7RyLNWqMa8t3apP9Fn9pRQREPlNNCA8J99tO6U8QR6Turd-7SGBWmi8vufxEsxw93XJ~X9LI2xWq7pK6YglaNIik-Aenn6s7ZHTkL8zod8vuo30Ds9KUvwyzj85ld6wL91EZebg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787749560&Signature=xen~vzRj5BjOvQuRH8HsZ0SQCl0SurqA7hYsbDEhti3EUFcJPV8bdhFfDCLWZZynp63VnI8w-oBrlKYxp6S99t~fEI-LDdDIhc5ABaFCNi61x~c4mWEG86dWiYmoT5NjOh3kf7ZfBUJwC4S2GG7VlawIrk5sAHvvTIYB1xAGjvpa0nI~iKW8rw9fKARGgM7PICLOzgBpYRx1Nf~ytbBsOnkpx8xWW2WLGpfCflKHXIn1aPQyTTm13uYa2EkwyYWrHTbXhUs~GkJ4qe1UfZp4uPg5RL0b0TLtZedR-jDcnGdv6Puf7FR-wlzRtRH9ryehaQPXPyupHn06kdZKDfK~hQ__&Key-Pair-Id=K2W722D70GJS8W)
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ありがとうございます