2009 Civil Service Exam-line test： Math Skills _1_ Civil Service skills by fdjerue7eeu

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```									2009 Civil Service Exam-line Measurement: Math Skills (1) civil service skills

civil service exam-speed calculation skills

009 civil service exam-line test: Math Skills (1)

data analysis part of the

score is a form of division, used to express the number of contrast between the two
volume relationship. Itself there are some quick answers to our questions very
beneficial properties.
nature: When the c / d = a / b when, c / d = (a + c) / (b + d) = a / b;
when c / d&amp;gt; a / b when c / d&amp;gt; (a + c) / (b + d)&amp;gt; a / b;
when c / d &amp;lt;a / b when, c / d &amp;lt;(a + c) / (b + d) &amp;lt; a / b;
(a, b, c, d are positive numbers)
to prove: that is to compare c / d, (a + c) / (b + d) and a / b the size of the relations.
first comparison (a + c) / (b + d) and a / b the size of the relationship.
(a + c) / (b + d)-a / b = (a + c) b / 【b (b + d)】-a (b + d) / 【b (b + d) 】
= (ab + bc-ab-ad) / 【b (b + d)】
= (bc-ad) / 【b (b + d)】
comparison is required bc and ad the size of the relationship.
when the bc-ad = 0, that is bc = ad, were imposed on both sides of the equation bd,
be c / d = a / b, at this time,
(bc-ad) / 【b (b + d)】 = 0, (a + c) / (b + d) = a / b;
when the bc-ad&amp;gt; 0, that is bc&amp;gt; ad, were imposed on both sides of the
equation bd, be c / d&amp;gt; a / b, at this time,
(bc-ad) / b (b + d)&amp;gt; 0, (a + c) / (b + d)&amp;gt; a / b;
when bc -ad &amp;lt;0, that is bc &amp;lt;ad, were imposed on both sides of the
equation bd, be c / d &amp;lt;a / b, at this time,
(bc-ad) / b (b + d) &amp;lt;0, ( a + c) / (b + d) &amp;lt;a / b.
or (a + c) / (b + d) and a / b of the relationship, and c / d and a / b line; the other hand,
is established.
further comparison c / d and (a + c) / (b + d) the size of the relationship.
the same token, can be:
when c / d = a / b when, c / d = (a + c) / (b + d);
when c / d&amp;gt; a / b when, c / d&amp;gt; (a + c) / (b + d);
when c / d &amp;lt;a / b when, c / d &amp;lt;(a + c) / (b + d).
description of the above, the ultimate get:
when c / d = a / b when, c / d = (a + c) / (b + d) = a / b;
when c / d&amp;gt; a / b when, c / d&amp;gt; (a + c) / (b + d)&amp;gt; a / b;
when c / d &amp;lt;a / b when, c / d &amp;lt;(a + c) / (b + d) &amp;lt;a / b;
, of course, pay attention to the point is, we assume that the conditions for a, b, c, d
are positive, if this condition does not hold, then the conclusion must also change.
However, data analysis part of the civil service examination of the operation appeared
basically on the positive operation between the application of this conclusion can
reduce the difficulty of solving problems.
Example 1: Excerpt from the 2008 Guangzhou in the first half-line measurement
Zhenti
"... ... According to statistics, in 2006 features industry base in Guangdong Province
total industrial output value reached 493 billion yuan, accounting for the province's
industrial output value 10%;-based high-tech product output value of 165 billion yuan,
accounting for high-tech product output value of the province's 11%. ... ... "
Q: Guangdong Province in 2006 features high-tech product output value of industrial
base industrial base about features What is the proportion of total industrial output
value?
A.38.5% B.33.5% C.30% D.20.3%
resolution: characteristic industry base in Guangdong Province-based high-tech
product output value of 165 billion yuan, Guangdong provincial industrial output
characteristic industry base is 493 billion yuan, the proportion is 1650 ÷ 4930.
using the above properties, then 1650/4930 = (1600 +50) / (4800 +130), 1600/4800
is 1 / 3, and 50/130 of greater than 1 / 3, the 1650/4930 is greater than 1 / 3, less than
50/130 ≈ 38.5%. Combination of options, only B is to meet the requirements.
Example 2: Excerpt from the 2008 line of Jiangsu Province, measuring A Class
Zhenti
"... ... 2005 National net decrease of 361,600 hectares of cultivated land (542.4 acres).
Which farmland used for construction 138,700 hectares (208.1 acres); In addition,
construction has been identified in previous years but did not change the occupation
of cultivated land area reported 73,400 hectares (110.1 acres); disaster damaged
53,500 hectares of cultivated land (80.2 acres); Ecology Abandoned 390,400 hectares
(585.5 acres); due to agricultural restructuring to reduce 12,300 ha of cultivated land
(18.5 acres); land reclamation and development of additional land 306,700 hectares
(460.0 acres) ... ... "
Q: 2005 Development on land consolidation and reclamation of cultivated land and
then add the actual reduction of cultivated area ratio
A. 84.82% B. 56.35% C. 51.55% D. 102.35%
resolution: 2005 net decrease of arable land 361,600 ha in 2005, land reclamation
and development of additional land area of 306,700 hectares, the latter with the
former ratio is 30.67 ÷ 36.16 = (30 +0.67) ÷ (36 +0.16), 30/36 = 5 / 6 ≈
0.833,0.67 / 0.16 ≈ 4, and significantly less than 30.67 ÷ 36.16 1, 30.67 ÷
36.16 greater than 0.833, to be elected A.
Example 3: Excerpt from the 2008 Beijing line measurement Zhenti
forms part of a 2001 provincial (municipal) the main indicators of the national
economy and the country's Rank

target provinces
GDP (million)
at the end of the total population (million)
disposable income of urban residents (yuan)
rural per capita net Income (yuan)

absolute precedence

absolute precedence

absolute precedence

absolute    Rank     Shanghai       Sichuan   44221086403636015198719
4662959759585617235211 4951816142512883158711 Fujian, Hubei, Hunan
39831265967678111229912 4254113440188313633817 32901463288566921202018
Beijing       Anhui,        Heilongjiang      356113381115542627228013
28461513832611578250262

Q: According to the provincial (city) at the end of the total population projections,
per capita GDP in 2001 compared, the following is correct
A. Hubei&amp;gt; Sichuan&amp;gt; Fujian&amp;gt; Hunan B. Hubei&amp;gt;
Fujian&amp;gt; Hunan&amp;gt; Sichuan
C. Fujian&amp;gt; Hubei&amp;gt; Hunan&amp;gt; Sichuan D. Fujian&amp;gt;
Hubei&amp;gt; Sichuan&amp;gt; Hunan,
resolution: First, the per capita GDP = GDP at the end of the absolute value of ÷ the
total population, while Hubei, Sichuan, Fujian, Hunan provinces respectively, per
capita GDP 4662/5975, 4422/8640, 4254/3440, 3983/6596. What is certain is that
only 4254/3440 is greater than 1, obviously 4254 is greater than 3440, the other three
were smaller than 1, excluding the A, B option. In option C, D in Hubei are in second
place, except that the ranking of the Sichuan and Hunan.
comparison of Hunan and Sichuan's per capita GDP ,4422-3983 less than
500,8640-6598 than 2000,500 / 2000 = 0.25, but half of 3983 than 6598, then
4422/8640 than 3983/6596, that is, In third place should be the Hunan, Sichuan, at the
bottom.