当a<0时 ,化简a-√ a²当a≤1时 ,化简√ (a-1)² 当x是怎样的实数时,下列二次根式有意义?√ x/x+1 已知x、y均为实数,且y=√ x-3+√ 3-x +1 求x/y+y/x
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![当a<0时 ,化简a-√ a²当a≤1时 ,化简√ (a-1)² 当x是怎样的实数时,下列二次根式有意义?√ x/x+1 已知x、y均为实数,且y=√ x-3+√ 3-x +1 求x/y+y/x](/uploads/image/z/1064819-11-9.jpg?t=%E5%BD%93a%EF%BC%9C0%E6%97%B6+%2C%E5%8C%96%E7%AE%80a-%E2%88%9A+a%26%23178%3B%E5%BD%93a%E2%89%A41%E6%97%B6+%2C%E5%8C%96%E7%AE%80%E2%88%9A+%EF%BC%88a-1%EF%BC%89%26%23178%3B+%E5%BD%93x%E6%98%AF%E6%80%8E%E6%A0%B7%E7%9A%84%E5%AE%9E%E6%95%B0%E6%97%B6%2C%E4%B8%8B%E5%88%97%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%BC%8F%E6%9C%89%E6%84%8F%E4%B9%89%3F%E2%88%9A+x%2Fx%2B1+%E5%B7%B2%E7%9F%A5x%E3%80%81y%E5%9D%87%E4%B8%BA%E5%AE%9E%E6%95%B0%2C%E4%B8%94y%3D%E2%88%9A+x-3%2B%E2%88%9A+3-x+%2B1+%E6%B1%82x%2Fy%2By%2Fx)
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