数学题:山路有多长
- 时间:2020-05-01 11:23:54
- 分类:数学世界
- 阅读:98 次
数学题:甲乙两地相距420千米,其中部分是山路,另一部分是平路,汽车从甲地开往乙地,共用了8小时,在山路上行驶的速度是每小时40千米,而在平路上的速度是每小时60千米,山路有多长?
数学题解答:此题可尝试用方程解答,设山路长度为x千米。
x÷40 + (420-x)÷60=8
若不会解答这个方程,可以改设在山路上行驶了x小时,列出另一个方程。
40x + 60(8-x) = 420
40x + 60×8 – 60x =420
480 – 20x = 420
20x =60
x=3
山路的长度:40×3=120(千米)
答:山路有120千米长。
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