题目(1)(1)(1)计算:2312÷24−(6−2)2\frac{2}{3}\sqrt{\frac{1}{2}}÷\sqrt{24}-(\sqrt{6}-\sqrt{2})^{2}3221÷24−(6−2)2；(2)(2)(2)当x=12(7+5),y=12(7−5)x=\frac{1}{2}(\sqrt{7}+\sqrt{5}),y=\frac{1}{2}(\sqrt{7}-\sqrt{5})x=21(7+5),y=21(7−5)时,求代数x2−xy+y2x^{2}-xy+y^{2}x2−xy+y2的值.知识点：二次根式的混合运算章节：未标注
