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问题 解答题

在一个三角形里，三个内角关系如下：当∠1大于∠2与∠3的度数之和时，这个三角形一定是钝角三角形．______．

答案

因为∠2+∠3＜∠1，且∠2+∠3+∠1=180°，所以只有当∠1大于90度的时候，∠2+∠3才会小于∠1，

所以∠1是钝角，所以这个三角形一定是钝角三角形；

所以原题说法正确，

故答案为：正确．

单项选择题

政府对工程质量的监督，表现了( )进行的质量控制。

A．从生产者角度

B．从需求者角度

C．从业主角度

D．从社会公众角度
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问答题

OOO Festival organised a day of traditional folk music to take place on a public holiday. It entered into a contract with a popular folk music group to play at the festival as the main attraction. As the group was in p demand, OOO Festival paid 50% of the group’s fee in advance to secure the booking. It entered into a further contract with OOO Sweep to remove litter and clean the venue after the event had fi nished.One day before the event, the folk music group contacted OOO Festival to inform it that the group’s most important musician had been taken ill suddenly, but a replacement group had been engaged to take the group’s place.Due to an administrative error, OOO Sweep found that they had insuffi cient workers to perform the cleaning duties after the event, but hired another cleaning company to carry out this work.Required:

(a) Examine the implications of the folk music group’s withdrawal from the event and its decision to engage the services of an alternative act to perform in its place. (4 marks)
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