The answers to the first grade mathematics unit test, the first unit test questions of the seventh g

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Multiple choice questions (4 marks, 24 marks in total).

1 The correct of the following calculations is (

a． b． c． d．

2 is calculated (

a． b． c． d．

3 The following is an excerpt from a student's calculations in a quiz, where the correct number is (

A 1, B 2, C 3, D 4.

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

a． b． c． d．

5 The following factorization is correct (

a． b．c． d．

6 As shown in the figure, in the rectangular garden ABCD, ab=, ad=, there is a rectangular road lmqp and a parallelogram road rstk in the garden, if lm=rs=, then the area of the greenable part of the garden is ( )a b

c d 2. Fill-in-the-blank questions (4 points per question, 28 points in total).

7 (1) When , is equal to

Decomposition Factor:

10 if, then the value is

11 The right table is a part of Yang Hui's trigonometric coefficient table, which is used to guide the reader to write the coefficients of the form (positive integer) according to the rules.

Rule. 12 There is such a law in the germination of a certain plant: the new sprouts of the current year do not germinate in the second year, and the old sprouts germinate every year after that, and the germination rules are shown in the following table (set before the first year'The number of new shoots is), and the ratio of the number of old shoots to the total number of buds at the 8th year is accurate.

Year 1 2 3 4 5 ....

Number of old buds....Number of sprouts 0 ....

Total number of buds....13. A gymnasium is inlaid with rectangular wooden boards of the same size, and two pieces are paved for the first time, as shown in Figure (1); The second time the first shop is completely enclosed, as shown in Figure (2); The third time completely encloses the second shop, as shown in Figure (3), ......In this way, after the first laying, the total number of planks used after the first inlay is indicated by letters

3. Answer questions.

14 (12 points) calculates:

15 (18 points) is known, (the value that is found.)

16 (18 points) A store has a backlog of 100 pieces of a certain commodity, in order to get rid of this batch of goods as soon as possible, the store has adopted the following sales plan, increasing the ** to the original times, and then making 3 price reductions: the first price reduction of 30%, marked "loss price"; the second time the price was reduced by 30%, marking the "bankruptcy price"; The third time the price was reduced by 30%, marking the "jump price". The sales results of the 3 price reductions are as follows:

The number of price reductions is one, two, three.

Sold 10 40 sold out.

1) What is the percentage of the "jump price" to the original price?

2) The product is sold according to the new sales plan, which plan is more profitable than the original price is sold out?