2*(根号2加根号3)+3*(根号9-2/3根号2)-27
问题描述：
2*(根号2加根号3)+3*(根号9-2/3根号2)-27
答
2*(根号2加根号3)+3*(根号9-2/3根号2)-27
=2√2+2√3+3×3-3×2√2/3-27
=2√2+2√3+9-2√2-27
=2√3-18;
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