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化简（1）\(\left ( {1-a} \right )\cdot \sqrt[{4}] {\frac {1} {\left ( {a-1} \right )^{3}}}=\)___.
（2）若 \(x < 3\)，则 \(\sqrt {9 - 6x + {x^2}} - \left| {x - 6} \right|\)＝___.
参考答案：\(-\sqrt[{4}] {a-1}\)；\(-3\)
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