(2) 120 divided by 1. Conditions: (65,438 fifth graders+0 sixth graders)
(3) 120 times (1+4 1) Condition: (There are more students in grade six than in grade five 1)
(4) 120 times (1-7/4) Conditions: (The number of students in grade six is 7/4 less than that in grade five)
(5) 120 divided by (1+4 1) Condition: ()
(6) 120 divided by (1-4 1) Condition: ()