题干

已知x、y是二元一次方程组 {x2y=32x+4y=5 的解,则代数式x2﹣4y2的值为____
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同类题1

根据短文理解,选择正确答案。

Rafting the GRAND CANYON Welcomes You!

    For an exciting,fun and challenging white water tours,Rafting the GRAND CANYON is here to help you plan the right tour for you. Whether you want to travel for two days or ten,hike in or not,go on an oar raft or motorized trip,we will help you find the trip that meets your needs.

    For those who will be vacationing on the off­season a trip on the Native American Red River rafting is available year around or a one ­day trip is available on the Colorado River from Diamond Creek to Pierce Ferry (about three hours from Las Vegas).

    Most of the trips depart from Lees Ferry,Arizona (approximately 21/2 hours from the south rim of the Grand Canyon).We offer partial trips which allow you to get on or off at Phantom Ranch located at the bottom of the Grand Canyon National Park South Rim. Requiring a hike in or out,with proper planning the horse ride up or down is also an option. Most trips occur between April and October.

    Since all rafting on the Colorado requires a permit,planning and reserving your trip requires reservations well in advance. Please let us know when you would like to go and we will contact all the river concessionaires (特许权获得者)to help you find the best trip for you.

    For planning your trip,questions,concerns or to make your reservations,please email or call the toll free number below. Since these trips are limited we highly recommend you make your reservations months in advance.

    To talk to a live person call us toll free:1­800­222­6966 or 702­655­6060

    If you have any questions regarding a trip,please CLICK_HERE to fill out our form. This will speed up the process of getting you accurate information regarding your trip.

    If you would like to send us an email other than about an up­coming trip you can contact us at info@raftingthegrandcanyon.com.

    We look forward to helping you plan your trip! (Please NO Travel Agents)

同类题5

走过2014,迎来2015.全面深化改革关键之年,改革依然任重道远。阅读材料回答下列问题。

材料:生态文明建设同经济建设密不可分。当前雾霾频发等环境问题本质上是经济建设中的不当行为造成的。推进生态文明建设,既要建立一套系统完整的生态文明制度,也要统筹考虑经济体制改革,必须顺应人民群众对良好生态环境的期待,推动形成绿色低碳循环发展新方式。向污染宣战,实施最严格的环境污染法,转变经济发展方式,逐步减少高能耗、高排放工业发展,淘汰落后产能,发展第三产业,优化能源结构﹣﹣新常态下的发展,将不再只有枯燥的GDP数字,而是更加注重百姓的生命健康、生活品质与生存环境。

中央确定的经济生态领域8个具有“四梁八柱”性质的综合性改革方案,目前除财税体制改革总体方案已经通过,其余深化国资国企改革、完善金融市场体系、深化科技体制改革、深化农村改革、构建开放型经济新体制、生态文明体制改革、深化住房制度改革等7个方案仍在等待出台。新一年,更需要一鼓作气,势如破竹地把改革难点攻克下来,落到实处。未来经济发展的新常态将与人们自身的“心常态”相互融合,改革红利持续释放,为中国经济社会描绘一幅更加壮美的时代画卷。

结合材料,从政治生活有关角度谈谈社会各界应如何为中国经济社会描绘一幅更加壮美的时代画卷。