汽车从甲地开往乙地，每小时行驶v1km，t小时可以到达，如果每小时多行驶v2km，那么可以提前到达的小时数为

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汽车从甲地开往乙地，每小时行驶v₁km，t小时可以到达，如果每小时多行驶v₂km，那么可以提前到达的小时数为（　　）

A： $\frac{v_{2} \cdot t}{v_{1} + v_{2}}$

B： $\frac{v_{1} \cdot t}{v_{1} + v_{2}}$

C： $\frac{v_{1} v_{2}}{v_{1} + v_{2}}$

D： $\frac{v_{1} t}{v_{2}} - \frac{v_{2} t}{v_{1}}$

上一题下一题 0.0难度选择题更新时间:2020-01-11 07:08:33

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A

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way , everything, eat , listen, much, do , try, more , fruit , knowledge, always , read

Food is very important. Everyone needs to____ well if he or she wants to have a strong body(身体). Our brains (大脑) also need a kind of food. This kind of food is ____ . We begin to get knowledge (知识) When we are very young. Small children are interested in everything around them. They learn ____ while (当) they are watching and ____ . When they are getting older, they begin to ____ storybooks, anything they like. When they find something new, they like to ask questions and ____ to find out the answer.
What is the best ____ to get knowledge? If we ____ by ourselves, we’ll get the most knowledge. If we're ____ getting answers from others and do not ask why, we will never learn well. When we study in a right way, we will learn ____ and understand (理解) better.

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