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1つ目の項36は6の2条です。3つ目の項の49は7の2条。2つ目の項84は2×6×7で84。(6y+7)²は公式に当てはめると、(a+b)²=a²+2sb+b²です。
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✨ Best Answer ✨
1つ目の項36は6の2条です。3つ目の項の49は7の2条。2つ目の項84は2×6×7で84。(6y+7)²は公式に当てはめると、(a+b)²=a²+2sb+b²です。
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ありがとうございます！