(2) Answer: The ratio of the corresponding two numbers = 80:1160: 2 240: 3 80:1= 80160: 2 = 80 240: 3 = 80 80 = 80.
(3) The two quantities in the table are directly proportional; Because distance divided by time = speed (certain), distance is proportional to time.
(4) It takes 120km to drive 1.5 hours.
42 pages. 42 pages is nothing, just a few formulas.
Answer (1) on page 43: There are two quantities in the table: the tonnage transported every day and the number of days needed; They are related quantities.
(2)300* 1=300 150*2=300 100*3=300 75*4=300
(3) Answer: This product represents the total tonnage of this batch of goods.
(4) Answer: The correlation in the table is inversely proportional; Because the tonnage transported every day * the number of days needed = the total tonnage of this batch of goods (certain), the tonnage transported every day is inversely proportional to the number of days needed.