1 is correct.

2 6 to 9, 0.54 to 0.98, unit price, exercise book, total price is positive.

Three 350km 350km lines reverse the speed and time.

4 anti

5 pairs 60 2 20 6

6 total price 250 450.

two

√ × √ √ × √

three

capital

four

1 Because fuel consumption ratio distance (fractional form) = fuel consumption per kilometer (certain)

So the fuel consumption is directly proportional to the distance traveled.

2 2.7

3 20 150

Don't you know?