✔ 最佳答案
董生的日薪 = x
彭生的日薪 = x – 100
董生的工作多少天 = D
董生的薪酬 = xD = 3600
x = 3600/D
彭生的薪酬 = (x – 100) (D + 3) = 3600
(3600/D – 100)(D + 3) = 3600
- 300 + 10800/D – 100D + 3600 = 3600
- 300 + 10800/D – 100D = 0
- 300D + 10800 – 100D^2 = 0
- 3D + 36 –D^2 = 0
D^2 +3D - 108 = 0
(D – 9)(D + 12) = 0
D = 9 or D = -12 (Reject -12)
董生的工作了 9 天
Check:
董生的日薪 = 3600/9 = $400
董生的的薪酬 = $400 x 9 = $3600
彭生的工作 12天
彭生的日薪 = $300
董生的的薪酬 = $300 x 12 = $3600