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(a+b)²+c²=A²+c²=(A+c)(A-c)=(a+b+c)(a+b-c)となります。a+bをAとおいて、因数分解して、Aを元に戻すと、出来ます！
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✨ Best Answer ✨
(a+b)²+c²=A²+c²=(A+c)(A-c)=(a+b+c)(a+b-c)となります。a+bをAとおいて、因数分解して、Aを元に戻すと、出来ます！
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(A+c)(A-c)=A^2-c^2ですよ