Core formula of base period quantity:?
Usually, the civil service examination is based on the known current period and growth rate.
In fact, the topic of distinguishing the base period is very simple. Information given this year, topics given last year. This kind of topic can basically be judged as a topic related to the base period.
Example 1:20 1 1 In the first eleven months, the total output value of high-tech industries in a province was 376.30 billion yuan, with an added value of 896.438+0 billion yuan. The added value increased by 30.74% year-on-year, which was 1 1.64 percentage points higher than the added value of industrial enterprises above designated size, accounting for 25.32% of the added value of industrial enterprises above designated size.
1 17 the first eleven months. 20 10, what is the added value of industrial enterprises above designated size in this province?
From 2972 to 3540.
Analysis: This question examines the calculation of the base period value. Give 20 1 1 year, let 20 10 year, that is, find out the formula of data set directly, and the quick calculation skill is estimation or direct division. In the first eleven months of 20 10, the added value of industrial enterprises above designated size in this province = =2972. So, the answer is option a.
The other is to find the sum or difference of two base periods, for example:
Example 2: Compared with 20 10, the annual output of 201aquaculture aquatic products is 40.26 million tons, an increase of 5.2%; The output of fishing aquatic products was 6,543,805,740 tons, an increase of 654.38+0.9%. How many million tons of aquatic products will China produce in 20 10? ()
1500
Similarly, the material in this question gives the quantity of 20 1 1, and finds the investigation base period of 20 10. Aquatic products include aquaculture and fishing, so they are the sum of two base periods. Therefore, the formula is that the output of aquatic products of 20 10 is 0, and the sum of the two base periods can be directly estimated by division. Formula, option d.
Example 3: According to the consumption mode, in August of 20 1 1 year, the catering income was171700 million yuan, with a year-on-year increase of16.7%; The retail sales of commodities was 65.438+0.2988 billion yuan, an increase of 654.38+0.7%. 20 10 how many billion yuan is the retail sales of goods higher than the catering income in August? ( )
a . 9630 b . 1 127 1 c . 12988d . 1 1 10 1
This problem is still about the calculation of the base period, but the difference between the two base periods. In August of 20 10, the retail sales of goods were higher than the catering income, and the quick calculation skill was proportional method, so 9630 was selected from the topic options. So choose option a.
To sum up, the calculation and comparison of base period quantity is very important, so everyone must practice more, firmly grasp the formula of base period quantity, and flexibly use quick calculation skills according to the characteristics of data, especially the quick calculation skills such as estimation and direct division.
~