Mathematics
Junior High
Solved
なんでx²＋xy＋y²が（x＋y）²－xyになるのか教えてください🙏🙏
の値を求めよ。
-2xy
② x² + xy + y²
<解答>
x² + xy + y²
=(x + y)2-xy
=52-7
=25-7
x²+xy+ y²
=x²+ y²+2xy-xy
= (x+y)2-xy
=18
(5
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やばい！分かりました笑！！！ありがとうございます！感謝です