数学357

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数学357

有一栋建筑物
屋顶是个斜坡
其剖面图是90度角的三角形
柱高分别为3米和5米和7米
室内宽度为6米
如图
请问走道宽度和绿地宽度各为多少?

算式
假设
走道宽度为a
绿地宽度为b

算式一
7:3=6+a+b:b
18+3a+3b=7b
3a=4b-18

算式二
5:3=a+b:b
3a+3b=5b
2b=3a

算式三
将算式二的结果导入算式一之中
会得到
b=9
a=6

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