∵正负根号5约等于正负2.235 正负根号6等于根号2*根号3等于1.414*1.732约等于正负2.449∴5的平方根+6的平方根=正负2.235+正负2.449∴①2.235+2.449=4.684约等于4.68 ②-2.235+2.449=0.214约等于0.21 ③2.235-2.449=-0.214约等于-0.21 ④-2.235-2.449=-4.684约等于-4.68
4.6855