计算：12-13-113．-数学

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• 解答下列各题：（1）计算：（48+20）-（12-5）；（2）解方程：x2-2x-4=0；（3）解方程：3（x-5）2=2（5-x）；（4）计算：3tan230°+2(sin45°-1)2．-数学
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• 计算：12-513+0.27+13．-数学
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• 计算23-3的结果是______．-数学
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