81-x^2≥0 -9≤x≤9
2sinx-√2>0 2kπ+π/4
1.求定义域：y=√(81-x^2) +log2 (2sinx-√2)
1.求定义域：y=√(81-x^2) +log2 (2sinx-√2)
数学人气：978 ℃时间：2019-08-26 06:48:51
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