要使右边的戚瞎腊两个根式有意义,须 x+y-199 = 0, 右边等于0左边的高滑神档两个根式之和也等于03x + 5y - m = 05x + 3y - m = 0所以3x + 5y = 5x + 3y , x = y结合x+y-199 = 0, x = y = 199/2