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20 1 1 National Unified Entrance Examination for Colleges and Universities (Shandong Volume)
reason
The branch of academic or vocational research.
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So in
Yes,
Therefore, dihedral angle A-BF-C is
20. Solution: (1) When?
At this time, it is not appropriate;
while
If, if and only if
When, in line with the meaning of the question;
while
At that time, it was irrelevant.
therefore
So the formula q=3,
therefore
(ii) Because
therefore
therefore
When n is an even number,
When n is an odd number,
All in all,
2 1. solution: (I) let the volume of the container be v,
Know from the meaning of the question
therefore
because
therefore
So the construction cost
therefore
(2) Derived from (1)
because
while
manufacture
therefore
(1) When
When,
therefore
Is the minimum point of the function y, and it is also the minimum point.
(2) When
that is
When,
while
Function monotonically decreases,
So r=2 is the minimum point of the function y,
All in all, when
When the construction cost is the lowest.
while
When the construction cost is the lowest.
22. (1) Solution: (1) Linear Time
When the slope of does not exist, p and q are symmetric about x,
therefore
because
On the ellipse,
therefore
①
because
therefore
②
Derived from ① and ②
now
(2) When a straight line
When the slope of exists, set a straight line.
The equation is
Know m from the meaning of the question
And replace it.
Have to
In ...
that is
…………(*)
and
therefore
Because point o points to a straight line
The distance is
therefore
and
arrange
And accord with that formula (*),
now
All in all,
The conclusion is valid.
(ii) solution 1;
(1) When a straight line
When the slope of exists,
Learn from (me)
therefore
(2) When a straight line
When the slope of exists, it can be known from (i)
therefore
therefore
, if and only if
When, the equal sign holds.
|OM| of ( 1)(2)？ The maximum value of |PQ| is
Solution 2:
because
therefore
that is
The only possibility is that
Time equals sign holds.
therefore
|OM|？ The maximum value of |PQ| is
(III) There are no three points D, E and G on ellipse C, so
Prove: Assumption exists
Derived from (i)
So d, e, g can only be used in
Choose three different points from these four points,
One of these three points must pass through the origin,
and
Contradictions,
Therefore, there are no three points d, e and g on ellipse C that satisfy the conditions.