800÷(1-50%-30%),
=800÷0.2,
=4000(米);
答:这条环山水渠长4000米.
某乡要修一条环山水渠,第一期修了全长的50%,第二期修了全长的30%,还剩800米没修.这条环山水渠长多少米?
某乡要修一条环山水渠,第一期修了全长的50%,第二期修了全长的30%,还剩800米没修.这条环山水渠长多少米?
数学人气:259 ℃时间:2019-08-19 21:38:05
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