请教：数学

wmelody1025

真正考试的数学和OG难度相差多少？

1What is the combined area, in square inches, og the front and back of a rectangular sheet of paper measuring 8.5 inches by11?

怎么翻译？？？

2On 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 fallon THe actual of number of miles per gallon that Cinfy's car got on this trip must have been between

答案？284/12.5 and 295/11.4

不是应该285/12.sand294/11.5?

[此贴子已经被作者于2009-2-18 17:31:05编辑过]