a，b为有理数，关于x的方程x3+ax2-ax+b=0有一个无理数根

某商品售价为180元，因销售效果不理想打八折出售，利润为54元，则原利润率为

体育课上，60名学生面向老师站成一行，按老师口令，从左到右报数：1，2，3，…，60，然后

若x、y是实数，满足，则3x2-2y2+3x-3y-2007= ． A．2006 B．-2008 C．1 D．-1 E．

已知a∈R，若关于x的方程有实根，则a的取值范围为______． A． B．a≥1 C．0≤a≤1 D．a≤-1 E．

若A为不等式组表示的平面区域，则当a从-2连续变化到1时，直线x+y=a扫过A中的那部分区域的面积为______． A． B．2 C． D． E．

如下图所示，将边长为2cm的两个互相重合的正方形纸片按住其中一个不动

There was a time when negotiation between management and labor followed a predictable pattern. With a wink and a smile on the factory floor, aggrieved unionized workers would go on strike and hand over a list of choke-the-company demands. With mock horror, management would deliver a meager pay rise and cite the difficult business climate as a reason for not being more generous. The two sides would then painfully hammer out a deal with mutual concessions, presumably in a smoke-filled room. But the workplace has evolved to meet the standards of a global economy, with its accompanying competition, mergers, acquisitions and international labor force: in the United States, at least, the strike—threaten-hammer model has been recognized as unduly painful and counterproductive. The two-tier hierarchy of management and labor has given way to a maze of responsibilities and relationships, all of which bring the interests of both sides closer together than ever before. Add to this the fierce international competition for jobs, and the diminishing influence of unions, so the need for a new approach to solving labor disputes and navigating contract relations becomes obvious. The mutual-gains approach to negotiation speaks to this need—something Joel Cutcher-Gershenfeld, the project co-director of Harvard University Law School's Program on Negotiation, calls "inter-space bargaining". It demands that the two sides leave behind conventional notions of winning and losing, and focus instead on their shared stake in the success of the company. "When people start to examine the underlying interests, it becomes easier to generate numerous options to satisfy those interests," suggests Mr. Cutcjer-Gershefeld. In order to help companies discover these shared interests, PON offers a series of two-day seminars four times a year, in which employers, employees and others come together to receive specialized training in collective bargaining. The course, "Negotiating Labor Agreements", is admired by unions and corporate leaders alike for teaching its 125 to 145 participants how to think beyond the bargaining box. Harvard University faculty and other management scholars engage participants with simulated exercises and realistic negotiating examples. The aim is to whittle away the familiar positions that come between the two sides, and to train them to brainstorm new solutions together. Now five years old, this program's most notable contribution to the field of collective bargaining is to bring management and labor into the same seminar, to learn the same strategies at the same time. The School of Industrial and Labor Relations at Cornell University in New York state also offers a two-day seminar on "Mutual Gains Negotiations; Win-Win Bargaining", which follows similarly innovative lines for resolving labor disputes. The ILR caters on management and labor separately, the program incorporates new interest- based strategies for bargaining. Part of its appeal among managers is its certificate program, which encourages negotiators to attend every one of its workshops in order to qualify for a Collective Bargaining Studies Certificate. Management and labor negotiation in the old day was predictable because it ______.

某工程的施工费用不得超过190万元，该工程若由甲公司承担，需用20天

函数y=loga(2x-5)+1恒过定点(m，n)，且(m，n)在直线bx+cy=3(b＞0，c＞0)上，则的最小值为______． A． B． C． D． E．

相交两圆的公共弦长为6，两圆的半径分别为，5，则这两圆圆心之间的距离为______．

已知n为正整数，方程有一个整数根，则n=______．

已知对所有实数x，恒成立，则m可取得的最大值为______．

已知菱形的一条对角线是另一条对角线的2倍，且面积为S，则这个菱形的边长为______． A． B． C． D． E．

多项式x3+ax2+bx+8的两个因式是x+1和x-2，则其第三个因式为______。

设y=|x-a|+|x-20|+|x-a-20|，其中0＜α＜20，则对于满足α≤x≤20的x值

已知a+b+c=-3，且则(a+1)2+(b+2)2+(c+3)2=______．

危与机·风险与收益 论说文：根据下述材料，写一篇700字左右的论说文，题目自拟。 有人说，机器人的使命应该是帮助人类做那些人类做不了的事情

某生产小组展开劳动竞赛后，每人一天多做10个零件，这样8个人一天做的零件数超过了200个

若直线3x-4y+12=0与两坐标轴的交点为A，B，则以线段AB为直径的圆的方程是______．