Tracking training 2:

Solution: Let the buying price of A shares be X yuan and the buying price of B shares be Y yuan. According to the sales price, we can get:

(1+20%)x= 1200, (1-20%)y = 1200, the solution is: x= 1000, y =1.

A: The two stocks lost a total of 100 yuan.

Step by step training:

1 . a2 . B3 . C4 . C5 . d 6.28 7. 125 8 . x+20 = 150×0.8 9.340 10.9。

1 1. solution: let the purchase price be yuan, and according to the meaning of the question, you can get (yuan).

12. Solution: Let the growth rate of oil price this month be x compared with last month. According to the meaning of the question:

( 1+x)( 1–5%)= 1+ 14%，x=20%。

A: The price of oil this month is 20% higher than that of last month.

13. answer: suppose a bought x pieces, then the meaning of this question is:

So Party A and Party B bought 32 yuan and 18 yuan respectively.

14. Solution: If the number of tapes purchased per 3 boxes 16 yuan is one box, there are:

15. solution: suppose the cost price of each product is reduced by x yuan.