计算：-23×2-1+12+(tan30°-cos45°)．-数学

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• （1）计算：|-2|-9-（π-1）0；（2）因式分xy2-9x．-数学
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• 计算（1）(23-1)(3+1)（2）22-1+18-412（3）(-13)-2-(3-1)0-|-2|+4（4）(13)-1-(5-2)0+18-(-2)2×2．-数学
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