题干

我们已经知道,有理数的加法运算法则,可以归纳为:①同号两数相加;②异号两数相加;③与零相加共三种类型,请根据加法运算的三种类型,各写出一个算式,使两个数的和是﹣3.5.

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解:根据题意得:(﹣2)+(﹣1.5)=﹣3.5;(﹣7)+3.5=﹣3.5;0+(﹣3.5)=﹣3.5.

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    Boys and girls, this summer vacation is the time for you to take your mind off homework and prepare yourself for future life. The following is some advice on 1 to make your vacation meaningful and colorful.

   Take exercise. Regular exercise, much health. You 2 hard most of the time so far. Therefore, you need to join in outdoor activities, which can bring your whole body into action. You can benefit from different forms of exercise 3 swimming,jogging and mountain climbing.

   Learn some basic life skills. One day, you will live alone. As a result, you can't 4 your family any longer. In order to deal with your 5 matters in your own life, you should learn cooking, washing and other practical (实用的) skills.

   Go for a journey. Travel to places of interest. In this way, you can find the culture there different from  6  of your hometown. Beautiful scenery can  7 make you relaxed. Imagine that you are lying on the warm beach in bright sunshine, with light seawind gently blowing. Isn't it enjoyable and comfortable?

   Enjoy family time. Home is the place in which you can rest, receive love and care from relations. Don't always sit in front of a computer alone. Instead, the whole family should spend 8 watching a movie on the sofa together. Besides, it's great fun for family members to gather around the table,   9sports, clothes or other common topics (话题).

   If you follow the advice above, you will achieve health, independence (独立),peace of mind and feelings between family members. Today is the beginning of a new life. Your summer vacation must be full of  10 and success. Wish you a wonderful time!