✨ Best Answer ✨
a^2−1＝(a+1)(a−1)←分母はこれを利用
(6×6×7×7×8×8×9×9×10×10)/(7×5×8×6×9×7×10×8×11×9)＝(6×10)/(5×11)＝(6×2)/11＝12/11
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ありがとうございます