题目的意思是长是宽的3倍,求m.所以根据这个列方程就可以了：
由于长平行于x轴,所以长度就是用B的横坐标减去C的坐标,得长=6-（1-m）=m+5
同理宽度就是A的纵坐标减去B的,就是：（m+1）-（10-2m）=3m-9
所以有m+5=3*（3m-9）
解得m=4
In the fihure ,the length of rectangle ABCD is 3 times its w
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