题干

一个两位数分解质因数:(    )=2×□×3,□代表一个个位数, 有几种可能?分别可以填多少?
上一题 下一题 0.0难度 选择题 更新时间:2018-01-16 08:01:31

答案(点此获取答案解析)

填2,则为12=2×2×3

填3,则为18=2×3×3

填5,则为30=2×5×3

填7,则为42=2×7×3

同类题2

阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项。

    It's a small gas station that has snacks, drinks, cigarettes, and candies. The young man behind the counter knows his 1by name and what they usually want to buy. He treats children and adults with equal2He reads science fiction behind the counter when business is3

    One day, three people rushed in and grabbed food off the shelves as fast as they could,4not planning to pay for it. He hit the “panic button”, then went over the counter and 5the front door. It was obvious they were homeless, and equally obvious that they weren't going6with the food. They7the food and simply crowded together in panic— knowing the police were8 the way.

    Imagine what they must have felt like when they were told they didn't have to steal if they were that9“We have food in the back, expired (到期) but still 10to eat. If you need food, you11have some.”

    They were told to12what they had dropped and put it back, and then asked to sort out the mess. They were doing just that13the police arrived. The officers were told the situation was under control and the police were no longer14.

    This wasn't what they had 15.They were being treated as human beings who could right the wrong they'd done. Shocked, they quickly followed orders to take turns and use the restroom to clean up themselves.

    Soon three 16people walked out with all the17their arms could hold. They were18that, if they needed to come back again, they were to ask and not just grab.

    And then the young man went back to read until the next customer came in. He would be the 19 person in the world to say he was a hero. But he gave three people something they were badly in need of —a20 amount of self-respect and a little bit of hope.

同类题3

    Hi, everyone, I'm Jane. Two years ago, my husband bought me a bicycle. If you live in a town, it is often faster than a car and you don’t have to worry about parking. You can leave it anywhere. As it has a seat at the back and a basket in the front, I can take my small daughter to school, to the library, to the shops, and to anywhere.
    I use it most in summer when the weather is warm and dry. It can be very unpleasant in winter when it is cold and the snow is heavy. Of course, you must be careful on a bicycle. Accidents are not the only problem. One day I went shopping with my friends. But when I came back, I found that my bike's front wheel was missing. It was a long walk to the bicycle shop. Now I have three strong locks(锁).
    My husband uses my bicycle sometimes for short journeys. He says it is better than waiting for a bus. He still uses his car for longer journeys, but I think that all the sitting down is making him fat and lazy. I like riding on my bicycle because I can exercise a lot and get much fresh air, and this makes me feel much younger.
____ Jane thinks a bicycle is __________ than a car if you live in a town.
____ It's convenient to use a bicycle because you can ride it to anywhere and needn't worry about __________.
____ When it is __________ in summer, Jane rides her bicycle.
____ For short journey, Jane’s husband doesn’t want to wait for a bus. He would like to __________.
____ Jane can get a lot of __________ and fresh air, so she likes riding very much.