(10分)先化简，再求值：，其中．-八年级数学

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• 解方程：x+1-3x+1=2．-数学
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• 用换元法解方程：x+1x-xx+1=32-数学
• 解方程：1x+1+1x-1=0．-数学
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• 若分式的值为0，则x的值为．-八年级数学
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• 解方程：1x-1+x2-3xx2-1=-2．-数学
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• 解方程：3x-2=2-xx-2-数学
• 计算：．-八年级数学
• 计算：．-八年级数学
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• 解方程：x2-2x-2=3x2-2x-数学
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• 解方程：x2=6x2-x+x-1-数学
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