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    已知xy的2次方等于-2,求xy(2x的3次方y的7次方-5x的2次方y的5次方-y)

  • 【What___(goon)inyourhousewhenI____(call)onyoulastnight?I___(ring)thebelltheretimes,butyou____(notanswer)thedoor.Judgingfromthenoisethat___(come)fromthesittingroom,I___(think)youmust___(have)aparty.】

    【What___(goon)inyourhousewhenI____(call)onyoulastnight?I___(ring)thebelltheretimes,butyou____(notanswer)thedoor.Judgingfromthenoisethat___(come)fromthesittingroom,I___(think)youmust___(have)aparty.】

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