6. I ride 100 meters every minute. Ride (2u) meters in 2 minutes, and ride (a*u) meters in 1 minute. (1) Use u for speed, t for time and s for distance. S=(ut)(2) If the line is 150m per minute and the time is 30 minutes, what is the distance? 150*30=4500 (m)

7. Use A for unit price, X for quantity and C for total price. Write:

C=-a*x Choose one from the left to calculate the following question.

a=c/x

x=c/a

If each bag of instant noodles 1.50 yuan, how many bags can 6 yuan buy? 6/ 1.5=4 (bag)

8.( 1) The temperature in the morning is B degrees Celsius, and it is 8 degrees Celsius higher at noon than in the morning. What does b+8 stand for? Indicates the temperature at noon.

(2) There are 50 students in a class, with 50-c girls. What does the c here mean? schoolchild

(3) In a basketball game, Uncle Xiaoyao hit X three-pointers in a row. What does 3x mean? Hit score

10. I hand in a copy every day. I hand in B copies every day.

(1) They submit a+b copies every day and 30(a+b) copies every 30 days.

(2) When a=60 and b=75, the total number of days is 30 days calculated by the formula (1) in the first question.