题目

. It is reported that two hotels，_____ are being built in my hometown，will open next year.  A．they both  B．which both   C．both of them  D. of which both 答案：D11．（1）计算下列各式的值．-$\sqrt{\frac{16}{49}}$=-$\frac{4}{7}$；$\sqrt{{3}^{2}+{4}^{2}}$=5．（2）计算：$\sqrt{9}$+$\sqrt{（-2）^{2}}$-$\root{3}{-27}$-|-1|．（3）已知9x2-4=0，求x的值．