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109→a
106→b
に置き換えると

109×109−2×109×106+106×106
=a×a-2×a×b+b×b
=a²-2ab+b²
=(a-b)²

ということなので
a→109
b→106
に戻してあげると与式になります

Ssssssho

ありがとうございます🙏🏽

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