【中学受験】入試算数（平面図形）ルートを使わないで、斜線部分の面積を求めよ。2通りの方法で解説！
Synopsis
中学受験 #平面図形 2008年立教女子中学の問題です。 さんよび（受験算数予備校）モッティー 昼は中高で数学、夜は進学塾で ...
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