题干

已知线段AB=8 cm,在直线AB上有一点C,且BC=4 cm,点M是线段AC的中点, 求线段AM的长.

上一题 下一题 0.0难度 选择题 更新时间:2019-12-01 10:03:53

答案(点此获取答案解析)

解:(1)当点C在线段AB上时,如图(1)AC=AB-BC=8-4=4(cm)

∵M是AC的中点,∴AM=
1
2
AC={#mathm

同类题2

任务型阅读

    What are some tips on becoming a writer?

    ____

    Most writers read whatever books they can find because they love to lose themselves in them. They like the sounds of language and the way that reading a good description can feel as satisfying as winning a baseball game or eating a banana split.

    ____

    It's easy to forget a good idea if you do not write it down immediately. If you get in the habit of carrying a notebook with you everywhere you go, you can write down anything you want to remember. When you are talking to friends in the cafe or waiting for the bus, something might spark an idea for a character or a scene in a story.

    ____

    Nearly all writers agree that writers must write. It doesn't matter if you feel like you have nothing to say; the important thing is that you write every single day. Sometimes, you need to give yourself permission to write things which won't be your best work.

    ____

    Do you have any friends who enjoy writing? Think about starting a writing group with other people who have similar interests. It helps to have the support of other writers. You will also receive valuable feedback, or suggestions, about how to make your work better.

    ____

    If you decide that you would like to send your work for publication, make sure to do your research. If you are sending your writing to a magazine, look through old ones. Does it seem like your writing fits in with the other stories or articles? That is the homework for you after writing.

A. Join or start a writing group.

B. Read everything you can.

C. Write every day.

D. Keep a notebook.

E. Stay active.

F. Do your homework.