goi so thu nhat la a(a< 3884)
khi do so thu hai la (3884 - a)
vi neu gap 4 lan so thu nhat va cong voi so thu hai thi duoc ket qua la 9731 nen ta co phuong trinh:
4a + 3884 - a = 9731
<=> 3a = 9731 - 3884
< => 3a = 5847
<=> a = 5847:3 = 1949 ( thoa man dieu kien a>3884)
=> so thu hai la 3884 - 1949 = 1935
Vay .............