问题
填空题
若关于y的方程 是一元一次方程，则a=___
答案
a＝－1
只含有一个未知数（元），并且未知数的指数是1（次）的方程叫做一元一次方程，它的一般形式是ax+b=0（a，b是常数且a≠0），高于一次的项系数是0．据此可得出关于a的方程，继而可求出a的值．
解：根据一元一次方程的定义可知：a+1=0，
解得：a=-1．
故答案为：-1．
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若关于y的方程 是一元一次方程，则a=___
a＝－1
只含有一个未知数（元），并且未知数的指数是1（次）的方程叫做一元一次方程，它的一般形式是ax+b=0（a，b是常数且a≠0），高于一次的项系数是0．据此可得出关于a的方程，继而可求出a的值．
解：根据一元一次方程的定义可知：a+1=0，
解得：a=-1．
故答案为：-1．
A Stress (压力) is everywhere in our everyday life. Men, women, the young and the old sometimes have stress. The most important reasons of stress are: death, diseases, exams, making money, changing jobs, ending friendships and so on. How do you know whether you have stress? Could you give your answers to the following questions?
Doing relaxing exercise, talking with friends and listening to light music are all usual ways relieving (减轻) stress. However, doctors now say that there are easier ways — people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should cry more often, because crying is the natural way of relieving stress. 小题1:Which of the followings is NOT one of the most important reasons of stress according to the passage?
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