设$a={\int }_0^{\pi }\left(\sin x+\cos x\right)dx$，则二项${\left(a\sqrt{x}-\frac{1}{\sqrt{x}}\right)}^5$式展开式中x²项的系数是(     )

Last night I was getting ready for the coming examination while the noise from my neighbor interrupted me. The noise went on and on. It was too loud that I could hardly pay attention with my study any longer. So I went to my neighbor house and said him, “Excuse me, would you please turn down the TV? I’m preparing for tomorrow’s examination.” Hear these words, his face turned to red. And he said, “OK, I will. I’m very sorry have made so much noise. Just now, the football game was very wonderful. I was too exciting to control myself. I won’t do that again. Good luck in your coming examination.” After that, I got down to his study.

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2000年1月，国务院组成了____领导小组，西部地区大开发战略正式启动。