阅读下面的解题过程：

解方程：|x+3|=2．

解：当x+3≥0时，原方程可化成为x+3=2

解得x=﹣1，经检验x=﹣1是方程的解；

当x+3＜0，原方程可化为，﹣（x+3）=2

解得x=﹣5，经检验x=﹣5是方程的解．

所以原方程的解是x=﹣1，x=﹣5．

解答下面的两个问题：

（1）解方程：|3x﹣2|﹣4=0；

（2）探究：当值a为何值时，方程|x﹣2|=a，

①无解；②只有一个解；③有两个解．

下列关于日本经济的说法，不正确的是（　　）

根据短文理解，判断正误。

    The summer vacation is over. It's true that time always flies fast. During the vacation, the weather was hot and I could not do much work, but I lived happily.

As the afternoon was hot, I did my work in the morning. I used to get up at 6:30 and take a walk in the garden for half an hour. After breakfast, I began reading English and Chinese and did some exercises in math. Those took me three hours or more. I worked quite hard and made good progress.

    I spent the afternoon outside. I went to swim and it was funny. I would not go home until it was about five or six o'clock. Sometimes a friend of mine would come to see me and we would spend some hours listening to music.

    In this way I spent my vacation happily. And I not only studied well but also became a good swimmer. Now I am in good health and high spirits.

某花木公司为了调查某种树苗的生长情况，抽取了一个容量为100的样本，测得树苗的高度（cm）数据的分组及相应频数如下：

107，109）3株；109，111）9株；111，113）13株；113，115）16株；115，117）26 株；117，119）20株；119，121）7株；121，123）4株；123，1252株．

（1）列出频率分布表；    

（2）画出频率分布直方图；

（3）据上述图表，估计数据落在109，121）范围内的可能性是百分之几？