Answers
(1)
a＾2-b＾2-c＾2+2bc
=a＾2-(b＾2-2bc+c＾2) …()の２乗作る
=a＾2-(b-c)＾2 …２乗－２乗
=(a+b-c)(a－b+c)
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![中学3年2次方程式の問題です。
問題文の[1つだけ整数の解をもつとき]と[2つの異なる整数... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1808181/thumb_l_webp_17834198910490.webp?Expires=1783752851&Signature=EmxsMG-NUtFEQkMsn1S2zy1oisHzwAM4ZDlCZJyBNwN2D5iZl-CC8922AXryLeuOFVzOMyNihDAVx~A514uCJ-oo6nx3Wq35Ld8wXqrCvBvgA68Y6k4v15b014W9DJmPlq44ePcXYM2Y862r9Gz~z5HgYNJUjWaw-~13mAwZAjCafhEGCHlOAUfPPsK~S9jGuvb7zQIelsOnublhlxKNEBYy2UmQTLOu2Xi1iPjWOcTiroNEyJGPWPZr0GoEUjdO5Udo10aHUlQapTYRHMs7bG8uZ7pgv76J6JOi5HVOQ0TVvtXHxHWURSSrSN70Vr9A16P8b5U98lKwVUw-HPPeeA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1783752851&Signature=vwuQQrDnurN7k13t0qnPvRXaNPm7sPdEOpjYDhu9UhAljqEF5R3a-zKLiPiXJCrDRy4~xLvrfZ~80lHtB9Z4n9SqoyJltiENF9lb3NHecW3gaiC1YlaLRe9moWWA2Tyre9VH8akjYaLdHo~LDWqFAOmPczIKBIIlNj-c-H2AF-WGaBWPQss4YgLXnjkueuMm8-TaoF7Pyxz4EXgzG2SlVwWcWlP34cY-BEH70Y-48~wKGYbzwfCvYStKsauut7096t18B38fojSoKsde7DUr5X0dxIyQ53Mg1mE6pvl2fnJ7usa0j9-WApWvDP5h7ixBSN0RiiwrT383uAjDbJM6CQ__&Key-Pair-Id=K2W722D70GJS8W)
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