咨询 OG13 数学第142题

Seven9208

On a recent trip, Cindy drove her car 290miles ,rounded to the nearest 10 miles and used 12 gallons of gasoline , rounded to the nearest gallon. the actual number of miles per gallon that Cindy 's car got on this trip must have been between ?原版解释不明白啊，哪位可以解释下啊？

findjuhl

round 是四舍五入，近似的意思。 rounded to the nearest 10 miles 应该是近似到10位吧，那 rounded to the nearest gallon就是四舍五入到个位了。和答案比比看对不对

Seven9208

万分感谢！明白了！

HenriWilligS

我想不通为何四舍五入D中有295

carry

没有特别明白，求解释...

marcox

round 是四舍五入，近似的意思。 rounded to the nearest 10 miles 应该是近似到10位吧，那 rounded to the ...
findjuhl 发表于 2013-3-8 22:15

    agree。。