已知(|x|-1)²+根号下y+1/x-y=0,试求x-8y的算术平方根
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![已知(|x|-1)²+根号下y+1/x-y=0,试求x-8y的算术平方根](/uploads/image/z/1644690-66-0.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%88%7Cx%7C-1%EF%BC%89%26%23178%3B%2B%E6%A0%B9%E5%8F%B7%E4%B8%8By%2B1%2Fx-y%3D0%2C%E8%AF%95%E6%B1%82x-8y%E7%9A%84%E7%AE%97%E6%9C%AF%E5%B9%B3%E6%96%B9%E6%A0%B9)
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已知(|x|-1)²+根号下y+1/x-y=0,试求x-8y的算术平方根
已知(|x|-1)²+根号下y+1/x-y=0,试求x-8y的算术平方根
已知(|x|-1)²+根号下y+1/x-y=0,试求x-8y的算术平方根
|x|-1=0
(y+1)/(x-y)=0
∴x=1
y=-1
∴ √(x-8y)=√9=3