Karekök kuralı, bir sayının karekökünün, kendisiyle çarpıldığında orijinal sayıyı veren bir değer olması kuralıdır. Formül olarak ifade edilirse: a, b'nin kareköküyse, a × a = b demektir.
5'in karekökü yaklaşık olarak 2,236'dır. Tam sayı olmayan kök değerlerini hesaplamak için hesap makinesi veya matematik hesaplama siteleri kullanılabilir.
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