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1.计算：．

++++++++++++++++++++++++++
正确答案: ['
．
']
解析:
解：原式=．

省流:[['
．
']]
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2.已知，求mathML． 1

++++++++++++++++++++++++++
正确答案: ['
16．
']
解析:
解：
．

省流:[['\n
16．
\n']]
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3.设，且，求的值． 1

++++++++++++++++++++++++++
正确答案: ['
4．
']
解析:
解：
mathML．

省流:[['\n
4．
\n']]
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4.已知实数满足，求mathML的值． 1

++++++++++++++++++++++++++
正确答案: ['
18．
']
解析:
解：本题中实数mathML满足，对其变形得：

所以mathML或mathML（mathML不符合题意），所以mathML,
,则．

省流:[['\n
18．
\n']]
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