化简：13-1-13+1=______．-数学

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• 计算：239x-6x4+2xx．-数学
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• 计算：|3-5|+25．-数学
• 计算：93-712+48．-数学
• 计算：27-1513+1448-数学
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• He _____in London for many years, but he has never regretted his final decision to move back to Chi
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• 计算：139a-2a1a+8a16．-数学
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• 计算：38-2=______．-数学
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