Mathematics
Senior High

この問題のとき、(X²+1/X²)まではわかったのですが、何故−1するのかが分かりません。どなたかに解説求めます💦💦

x = 2-√√31²Z 一√のとき 7²³ + 73 = {( x² + 22-1 + 7²
数ⅰ

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