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.