题干

中国古代数学家杨辉的《田亩比类乘除捷法》有这么一道题:“直田积八百六十四步,只云长阔共六十步,问长多阔几何?”意思是:一块矩形田地的面积为864平方步,只知道它的长与宽共60步,问它的长比宽多多少步?经过计算,你的结论是:长比宽多(   )

A:12步

B:24步

C:36步

D:48步

上一题 下一题 0.0难度 选择题 更新时间:2018-02-20 07:01:42

答案(点此获取答案解析)

A

同类题5

阅读短文,然后根据其内容选择正确答案。

Dear mum and dad,

    I'm writing this letter to you from the center of Australia. At themoment we're staying near Uluru—that's the aboriginal(土著) name for Ayers Rock. On the first day, we took a balloon tour over the rock, and I was surprised at how big it was: 3.6 kilometers long and 384 meters high. The colors of the rock are fantastic, and at different times of the day, they change from purple to red. The Aborigines are the first people of Australia, and the ancient aboriginal stories describe the spirits that created the world. Uluru is a center of Aboriginal culture.

    The Australians have many British relatives. That's why they're like us in many ways. Their family life is similar to ours, and they enjoy the same food and hobbies. The food and drink that most Australians like are grapes, lamb, ham and especially wine that they make in the south of the country. They love all sports, but football is the most popular. Most Australians live near the coast, so they also love going to the beach, swimming and surfing.

Although it's December, it's summer over here. The sunshine is very bright, and near the coast the countryside is very green. There are lots of sheep in the fields and on the hills, but the outback(澳洲内陆) is more like a desert, full of rocks and sand.

    The next day after we arrived at Uluru, we went on a camel(骆驼) ride. The camel that I rode had a bad temper. When I sat on its back, it became very angry and refused me. So everyone else thought it was very funny that my camel kept lying down…

    Finally, later this evening, we're taking the plane back to Sydney and coming home, it's been a fantastic trip!

Tony