1. The following calculation is correct ().

A.B. C. D。

2. The calculation result of is ()

A.B. C. D。

3. The following is an excerpt from a classmate's calculation in an exam, in which the correct number is ().

①; ②;

③; ④

1。

4. If it is the square of a positive integer, the square of an integer greater than 1 is ().

A.B. C. D。

5. The following decomposition factor is correct ()

A.B.

C.D.

6. As shown in the figure, in the rectangular garden ABCD, AB=, AD=, and a rectangular road LMQP and a parallelogram road RSTK are built in the garden. If LM=RS=, the area of the green part in the garden is ().

A.

B.

C.

D.

Fill in the blanks (4 points for each small question, 28 points for * * *)

7.( 1) When _ _ _ _ _ _ _ _, it is equal to _ _ _ _ _ _ _ _;

(2)___________

Decomposition factor: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

9. Pack a box with length, width and height respectively. The packing method is shown in the figure. The total length of the packing tape should be at least _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (expressed by algebraic expression containing,,,).

10. If, then the value of is _ _ _ _ _ _ _ _.

1 1. The right table is a part of Yang Hui's triangle coefficient table, and its function is to guide readers to write the coefficient in the form of expansion (positive integer) according to the law. Please carefully follow the rules in the table below and fill in the missing coefficients in the expansion.

rule

12. A certain plant germinates according to this rule: the new bud does not germinate in the second year, and the old bud germinates every year thereafter. The germination rule is shown in the following table (assuming that the number of new buds before the first year is). At this rate, the ratio of the number of old buds to the total number of buds in the eighth year is _ _ _ _ _ _ _ _ _ _ _. (accurate to 0.

X years 1 2 3 4 5 …

Number of old buds ...

The number of new shoots is 0 …

The total number of buds ...

13. A gymnasium is inlaid with rectangular wooden boards of the same size, and two pieces are laid for the first time, as shown in figure (1); Completely closed for the second time 1 paving, as shown in Figure (2); The third time, the second paving is completely closed, as shown in Figure (3) ... According to this method, after the first paving, the total number of boards used after the first mosaic is represented by the letter _ _ _ _ _ _ _ _ _.

Third, answer questions.

14.( 12 points) Calculation:

15.( 18 points) The value of () is known.

16.( 18 points) A certain product in a certain store is overstocked 100 pieces. In order to get rid of this batch of goods as soon as possible, the store adopted the following sales plan, which increased the price to 2.5 times, and then reduced the price three times: the first time, the price was reduced by 30%, and it was marked as "loss price"; Reduce the price by 30% for the second time and mark "Bankruptcy Price"; Reduce the price by 30% for the third time, and mark "jumping price". The sales results of the three price reduction treatments are as follows:

Number of price reductions one, two, three

The number of pieces sold is 10 40.

(1) What percentage of the original price is the "sale price"?

(2) The goods are sold according to the new sales plan, which plan is more profitable than the original price and which one is completely sold out?