For a study class, it takes112 hours for review,13 hours for teachers to talk about new lessons, and 1/4 hours for classroom study. Please give the answers to two math problems.

The questions are as follows. Please choose two questions to answer.

(1) How long does it take the teacher to talk about the new lesson than to study in class?

(2) How long will this course last? (Suppose there is only review time in this class, and the teacher talks about new lessons and classroom learning.)

(3) How much more time is spent studying in class than reviewing?

(4) Which part of this class accounts for the most and which part accounts for the least?

Solution: (1) It takes 1/3 hours for teachers to talk about new lessons and 1/4 hours for classroom learning, so the time for teachers to talk about new lessons is1/3-1/4 =1/65438.

(2) Review takes112 hours, teachers take 1/3 hours for new lessons, and classroom study takes 1/4 hours. The total learning category is * * *112+1.

(3) Review needs112 hours, and classroom study needs 1/4 hours, that is,112 = 2/12 =

④ because1/3 >; 1/4 >112, so teachers spend the most time talking about new lessons and the least time reviewing.