题干

小明在数学课中学习了《解直角三角形》的内容后,双休日组织教学兴趣小组的小伙伴进行实地测量.如图,他们在坡度是i=1:2.5的斜坡DE的D处,测得楼顶的移动通讯基站铁塔的顶部A和楼顶B的仰角分别是60°、45°,斜坡高EF=2米,CE=13米,CH=2米.大家根据所学知识很快计算出了铁塔高AM.亲爱的同学们,相信你也能计算出铁塔AM的高度!请你写出解答过程.(数据 2 ≈1.41, 3 ≈1.73供选用,结果保留整数)
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解:∵斜坡的坡度是i=
E
F
F
D
= 12.5

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    As a child, I started learning to play the piano, my favorite musical 1 but I was forced to give up when I started my middle school2 I could concentrate more on my studies.

    It's one of my biggest3 to stop practicing the piano when I recall sadly today. During the following years, I kept telling my piano teacher that I would4However, I didn't keep my promise because I was 5 with my study6 I lost touch with my teacher. Some years later, my teacher died. I was very sad because I lost such a good teacher. She was a very warm and gentle person. It hurts me to think she may have been 7 that I never returned. I haven't taken lessons since then but to be honest, I 8 to. Sitting at the piano, I couldn't help recalling many 9 ---times of my practising at home and playing before my teacher and one time my teacher 10 me after I played entire pieces of music wrong in front of her colleagues. I was so 11 that I could hardly say anything. But her 12helped ease my shame. These memories13good or bad, never caused my14 for playing the piano again.

    This thought then led me to think that 15 is like music, and that we all try to play different 16 in the instrument of our life. Sometimes the pitch (音高) is17when we play it well, but sometimes we are out of tone. However, we all continue to create our own 18style of music. No matter what style our music is, it is 19 that we sing the songs of joy, quietness and love. Though I may never make it back to piano lessons, it doesn't 20 that I've stopped making music.