题目

做大小两个长方体纸盒，尺寸如下（单位：cm）长宽高 小纸盒abc 大纸盒4a2.5b2c （1）做这两个纸盒共用料多少平方厘来？ （2）做大纸盒比做小纸盒多用料多少平方厘米？ （3）若a＝6，b＝5，c＝3，则大纸盒的体积是多少cm3？ 答案：解：（1）做这两个纸盒共用料（单位：cm2）（2ab+2bc+2ac）+（20ab+16ac+10bc）， ＝2ab+2bc+2ac+20ab+16ac+10bc， ＝22ab+12bc+18ac； （2）做大纸盒比做小纸盒多用料（单位：cm2）， （20ab+16ac+10bc）﹣（2ab+2bc+2ac） ＝20ab+10bc+16ac﹣2ab﹣2bc﹣2ac ＝18ab+8bc+14ac； （3）大纸盒的体积V＝4a×2.5b×2c＝20abc， 当a＝6，b＝5，c＝3时V＝阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。DubaiDubai was a 6,000-person fishing village half a century ago. Since 1966, when oil was discovered there, the population of Dubai has grown 1. 2.6 million. Over the years, it has become a well-known tourist destination.2._ attracts tourists to Dubai are tax-free shopping, dry weather, excellent accommodations, delicious food and beaches that go on for miles. In fact, some foreigners come here only 3. （experience） the shopping. There are dozens of shopping malls, 4._ （provide）every famous brand you can name. Those outdoor markets sell everything from spices（香料）to gold at fair prices.Choosing what places to visit in Dubai is difficult, because even the hotels there are also amazing 5. （attract）. The Burj A1 Arab is considered one of the world’s best hotels, and __6. is located on its own island, about 1,000 feet offshore from Dubai. Built in the shape of __7. ship, this hotel is still 8. （tall） than the Eiffel Tower and nearly as tall as the Empire State Building. Certainly, there are also other great places of interest to visit.Indeed, travelling around this country will 9. （true）give you an amazing experience because of its interesting things 10. （offer） to all types of tourists.