一道ds,thx!

gigi

DS:程序员的平均工资是x, 统计员的平均工资是y,问程序员和统计员加起来的平均工资是否小于（x+y)/2?
1) 程序员多于统计员 2) y-x=4200

[em27][em27]

jackco

the answere is E. did you ask cx+ty/c+t

tongxun

The answer should be C
let 程序员: x, 统计员 : y
(ax+by)/(a+b) < (x+y)/2
(x+y)/2 -(ax+by)/(a+b) ) > 0
[(x+y)(a+b) - 2ax-2by]/2(a+b),
because a+b>0, we need to know whether (x+y)(a+b) - 2ax-2by >0
ax+bx+ay+by-2ax-2by = (a-b)(y-x)
a>b and y>x, (x+y)(a+b) - 2ax-2by >0

gigi

答案是C,谢谢！