To solve the following problems, to explain, to process

2007x2008=(1-1 2007)x2008=2008-2008 2007=2006/2006

2. The area of the shaded part is the area of 1 4 circles - the area of the square.

i.e.: 1 4

The diagonal of the square is 5, and the other diagonal is also 5, so it can be divided into the sum of the areas of two large right triangles.

The first question is ambiguous and cannot be answered because the numerator and denominator positions of 2007 and 2008 are not known.

Question 2. S1 total area - S2 square area = S3 shaded area.

The area formula for a circle is s=

Because it is a quarter of a circle, the total area in the figure is s1 = s 4 square area s2 = (5 * 2 of the root number 2) square.

1.Approximately equal to 2007 i.e. 4028048 20072The blank part will be a square.

It can be seen that the side length of the square is 5, number, 2, 2

Square area s = 5 root number 2 2 * 5 root number 2 2 = 25 2 sector area s = 25 4

The shaded area s is equal to 25 4-25 2

2. Because the diagonal side is 5, the side length is 5 open square), and the square area is 25 2

The shaded area is 1 4 * 5 2-25 2

Slow only answer] :d

Answer] d. Analysis: Only when problems are found, it is possible to raise problems, analyze sensitive problems, and further solve problems. Identifying problems is the first step in the problem-solving process. Which bridge is wide.

Lead pat answer is like a case]: a

A [Analysis] Only when problems are found, it is possible to raise problems, distinguish and analyze problems, and further solve problems.

Answers]: a, b, c, d

The specific psychological process of problem solving is divided into four stages: Finding a problem: It is recognizing the existence of a problem and generating the need and motivation to solve it.

Being good at finding problems is an important indicator of the level of thinking development. Analyzing the problem: It is to find out the requirements and conditions of the problem, discover the connection and relationship between them, grasp the essence of the problem, and determine the direction of solving the problem.

Hypothesis: Hypothesis is to propose a solution, strategy or way to solve the problem. Verify the hypothesis:

Through practical activities or mental manipulation, it is verified whether the proposed hypothesis can actually solve the problem and achieve the goal.

2000-1800=200 (yuan).

The electricity bill in May was 200 yuan less than that in April.

200 ÷2000 x100%=10%

The electricity bill in May was 10 percent lower than that in April.

24 hours a day, day than 3:5 p.m

24 times three-eighths during the day equals nine hours.

24 times five eighths in the evening equals 15 hours.

15-9 = 6 hours less during the day than at night.

Daytime: 3/24 (3+5) = 9 (hours).

Nights: 24-9=15 (hours).

Day is shorter than night: 15-9 = 6 (hours).

2) b4) may generate k2

The MNO 4 decomposition shed is releasing oxygen (or generating a chain cavity reluctance oxygen compound, and a paradecomposition of the circle releases oxygen).

After the first operation, the rectangle is a on one side and 20-aa > 20-a on the other

After the second operation, the rectangle is 20-a on one side, 2a-20 on the other, if 20-a>2a-20 (a<40 3).

2a-20=20-a-(2a-20), a=20, not eligible.

If 20-a<2a-20

2a-20-(20-a)=20-a, a=15, eligible.

So a=15

The first operation: cut the square with a side length, and the remaining rectangle is long a and 20-a wide (10 The second operation: the square with a side length of (20-a) is cut, and the remaining rectangle is 20-a long and a-(20-a) wide

Third operation: The remaining rectangle is a square, then the length of the remaining rectangle after the second operation is equal to 2 times the width.

So there is 20-a=[a-(20-a)] 2 or (20-a) 2=a-(20-a).

Solve these two equations separately to obtain: a=12 or no solution of the latter equation.

So when n=3, the value of a is 12

Pear Yuan.

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