khoi 1:
400-39=361(h/s)
2 khoi :361+400=761(h/s)
d/s:....................
Bai giai
So hoc sinh khoi lop 1 co la:
400 - 39 = 361( hoc sinh )
So hoc sinh hai khoi lop co la:
400 + 361 = 761( hoc sinh )
Dap so: 761 hoc sinh.
Ca 2 khoi co:
400+361=761
Dap so: 761 hsinh