设总长为x
则 0.3x+800=x
800=x-0.3x
800=0.7x
x=1142（自己再算一遍）
这条路长多少米?一条路已经修了百分之30,距离终点还有800米,这条路长多少米?
这条路长多少米?一条路已经修了百分之30,距离终点还有800米,这条路长多少米?
数学人气：968 ℃时间：2019-09-17 20:17:05
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