Question

用解方程解答，求图！！！

Answer 1

设X为男生人数, Y为女生人数.

1. X = 7/9 (Y);

   Y=9/7 X

2. X+3 = 8/17 (X+3+Y)

        X+3 = 8/17 (X+3+9/7 X)

        X+3 = 8/17 (3 + 16/7 X)

        X+3 = 24/17 + 128/119 X

        3 - 24/17 = 128/119 X - X

        27/17 = 9/119 X

               X = 27/17 * 119/9

                  = 21

        Y = 9/7 X

           = 9/7 * 21

           = 27

X+ Y = 21+27

         = 48

 

原来有48人

Answer 2

2。设文艺队原来有女生x人，
则文艺队原来有男生(7/9)x人，文艺队原来有(16/9)x人，
根据题意得：
(7/9)x+3=[(16/9)x+3]X(8/17)
解这个方程得：
x=27
(16/9)x=48
答：原来文艺队有48人。

Answer 3

Answer 4

Answer 5