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数学
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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?
人气:280 ℃ 时间:2019-09-17 20:17:05
解答
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)
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