题干

如图,方格纸中的每个小方格都是边长为1个单位的正方形,在建立平面直角坐标系后,△ABC的顶点均在格点上,点C的坐标为(4,﹣1).

①以O为位似中心在第二象限作位似比为1:2变换,得到对应的△A1B1C1,画出△A1B1C1,并写出C1的坐标;

②以原点O为旋转中心,画出把△ABC顺时针旋转90°的图形△A2B2C2,并写出C2的坐标.

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答案(点此获取答案解析)

解:①如图所示:△A1B1C1,即为所求,

C1的坐标为:(﹣8,2);

②如图所示:△A2B2C2,即为所求,

C2的坐标为:(﹣1,﹣4).

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    You often find somebody who works around you complaining(抱怨) all the time, don't you?____ About 70% of Americans say being around nonstop complainers sometimes has a bad influence on them. Luckily, here are 4 tips to help form positive patterns.

    ⒈Self­awareness

    When a negative(消极的) thought pops into your mind, immediately correct it. Instead of telling yourself “That's a nice shirt, but I can't afford it,” change the message to “That will look great with my black pants when I can afford it.”____

    Of course everyone complains  sometimes. But the less frequently you complain, the better you will feel.

    ⒉Distance yourself

    ____ Excuse yourself and go somewhere quiet, somewhere outdoors in the fresh air. Think of something pleasant before returning. You have to take this seriously because negative people can and will pull you into the quicksand.

    ⒊Don't try to change complainers

    If you find yourself trapped in a group of complainers in a meeting or at a social event, simply choose silence. Let their words bounce off you while you think of something else. Attempting to stop the complaining can make you a target.____ If someone says, “I hate Mondays; weekends are too short,” try to think, “I'm glad I rested up over the weekend, so I'm ready to make some improvement on that big project.”

    ⒋____

    When someone is shouting at you angrily, throw the responsibility back at them by asking, “So what do you intend to do about it?” In most cases, complainers don't really want a solution(解决方法). They just want to speak them out. If you make them aware that they themselves have to find the solutions, they will leave you alone and find someone else to complain to. If so, you will be happy.

A.Find solutions

B.Change responsibility

C.You have got a lot of company.

D.By doing this, it will lead to positive behaviors.

E.But you can redirect the discussion in your own mind.

F.Whenever possible, escape from negative conversations.

G.You will never know what they are going to talk about.