1.x and y are positive numbers.
Quantity A:sqrt(x)-sqrt(y)
Quantity B:sqrt(x-2*sqrt(xy)+y)
选项:a. A is greater. b. B is greater. c.equal d. cannot be determined.
2.To fill a larger concert hall, a madrigal singing group consisting of sopranos, altos, and bases, in a 5:7:3 ration, needs 40 singers. What is the least number of basses the group will need?
是道填空题,直接把答案填格子里