Mathematics
Senior High
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(2)です
なぜ14の2乗になるんですか?
さらに途中式書いてほしいです

(2) x² + y² = (x³+y³)² −2x³y³ = (x³ +y³)² −2(xy)³ =142-2(-1P=196+2=198 xyz. のとき
恒等式 対称式の値

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