Mathematics
Junior High
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計算 数学

Answers

✨ Best Answer ✨

x^2+xy+y^2
=(x+y)^2-xy
=(2√5)^2-(5-4)
=19

*a^2はaの二乗
(a+b)(a-b)=a^2-b^2

usagi

ありがとうございます!
助かりました!

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