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问题 计算题
计算
（1）-3m(2m+n-1)（2）(3x-2)(x+4)
（3）(x+y-2)(x+y+2).
答案

（1）-6m2-3mn+3m； （2）3x2+10x-8； （3）x2+2xy+y2-4.

问答题

On 1 June 2009, Shoes Galore received brochures from Rubbersoles, the local distributor of the ‘Adeedust’ brand of sports shoes, advertising the latest limited edition of Adeedust shoes for sale at $50 per pair. Shoes Galore wanted to get their hands on the limited edition shoes, so they quickly sent an e-mail to Rubbersoles stating, ‘we are glad to place an order for 100 pairs, on 30-day credit terms.’On 2 June 2009, Rubbersoles replied by e-mail that they could deliver 100 pairs, cash on delivery. On 3 June 2009, Shoes Galore sent out a letter informing Rubbersoles that they were agreeable to paying cash on delivery of the Adeedust shoes. This letter reached Rubbersoles on 5 June 2009.On 4 June 2009 Rubbersoles e-mailed Shoes Galore stating that they were no longer in a position to deliver the Adeedust shoes as they had run out of stock (inventory) due to overwhelming demand.Required:Discuss whether there is a binding contract between Rubbersoles and Shoes Galore. (10 marks)
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单项选择题

对于夹紧力针对工件支承面情况，可采用辅助支承，减小变形的方法是为了消除（）

A.传动链误差

B.调整误差

C.理论误差

D.装夹误差
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