on a recent trip,Cindy drove her car 290 miles,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?
答案是:284/12.5 and 295/11.4
可是按照round四舍五入不是应为285/12.4 and 294/11.5?
谁来解决一下谢谢啊 |