【单选题】设 是由曲线 和 围成的平面区域,则 ( )
【单选题】The ratio of 2 quantifies is 5 to 6. If each of the quantities is increased by 15, what is the ratio of these two new quantifies?
E.
It cannot be determined from the information given.
【简答题】What is the ratio of 2a to b? (1) a/b=2 (2) a+b=5
【简答题】What is the duty ratio? How to calculate the duty ratio?
【单选题】设 是由曲线 和 围成的平面区域,则 ( )
【单选题】If 5/9 of the members of the school chorus are boys, what is the ratio of girls to boys in the chorus?