Foreword 123456 Total score

score

First, fill in. (***20 points)

1. When opening the calculator, press the () key. If you want to clear the screen, please press the () key when the screen is closed.

2. There are m rows of apple trees, each row is 16 trees; There are B pear trees. There is a tree in an apple tree and a pear tree. When m= 10 and b=80, an apple tree and a pear tree have () trees.

3. Use a formula containing letters to express the following quantitative relationship.

(1) Given the speed and time, find the distance ().

(2) Given the distance and speed, find the time ().

(3) Given the distance and time, find the speed ().

4. Any triangle has the property of () and has the height of ().

5. All three angles of an equilateral triangle must be () angles.

6. The three internal angles of a triangle are ∠ 1, ∠2, ∠3, and ∠ 1=72? ,∠2=35? , then ∠3= (), this is a () triangle.

7. The base angle of an isosceles triangle is 30 degrees? Its vertex angle is () degrees.

The sum of the five digits of 8 and the four digits of 8 is (), and the difference is ().

9. The side length of a square vegetable field is one meter, the perimeter is () meters, and the area is () meters 2.

10. If n is used to represent one of three consecutive natural numbers, then this natural number is () and the smallest natural number is ().

Second, choose one. (***6 points)

1. An electronic workshop plans to produce 40,000 electronic components this year, and actually produces X electronic components every month. According to this calculation, the annual output can exceed ().

a、40000+X B、40000+ 12X

c、 12X-40000 D、40000 X

2, the following length of each group of line segments, can form a triangle is ().

a、3 3 6 B、3 7 1 1 C、2 5 4 5 2D、8 9 10

3. The two sides of a triangle are 6cm and 7cm respectively, so the length of the third side may be ().

A, 1 cm b, 0.5cm c, 3cm d,13cm

4. In a triangle, the degree of one angle is equal to the sum of the degrees of the other two angles, and this triangle is a () triangle.

A, acute angle b, right angle c, obtuse angle d, uncertainty

5. This year, Xiaogang's brother is X years old and Xiaogang is (x-6) years old. In another n years, his brother will be () years older than Xiaogang.

a、n B、6 C、n-6 D、n+6

6. The result of "a-b-c" in the following formula is equal to ().

a、a-(b-c) B、a-(b+c) C、a-(c-b) D、a+b-c

Third, sentence. (***6 points)

1. If the length of an equilateral triangle is one meter, its circumference is 4a square meters. ( )

2. An equilateral triangle is not necessarily an isosceles triangle. ( )

3. Countless heights can be made from a vertex of the parallelogram to the opposite side. ( )

The figure composed of three line segments is a triangle. ( )

5. Parallelogram and trapezoid have countless heights. ( )

6,2a must be less than a2. ( )

Fourth, do math. (***38 points)

1, how to calculate as simple as possible. (30 points)

1 125+98+75+202 865-65-223-277 32× 125

9000÷ 125÷8 37×35+65×37 (25+22)×4

10 1×67 99×63 65×99+65 85×20 1-85

2. Find the degree of the unknown angle in the triangle below. (8 points)

Fifth, draw a picture. Draw an isosceles trapezoid and an isosceles triangle on the bitmap and make their heights respectively. (***6 points)

Sixth, solve the problem. (***24 points)

1, the two cars start from Beijing and Shanghai at the same time, the bus 105 km/h, the van 95 km/h, and meet in about 7 hours. What questions can I ask? (Ask and answer questions) (6 points)

2. It takes 12 minutes for Xiao Liang to go to the library by bike and ride one meter every minute. It took 15 minutes to come back against the wind, riding b meters every minute on average.

(1) How many meters did Xiao Liang ride back and forth? (2 points)

(2) When a=200 and b= 160, how many meters did Xiao Liang ride back and forth? (3 points)

The shop sent 54 cases of apple juice and 46 cases of orange juice.

(1) 24 bottles per box. How many bottles of these drinks are there? (3 points)

(2) The price of each box of drinks is 48 yuan. How much do you have to pay for these drinks? (3 points)

(3) If these drinks are wholesale to food stores at the price of 55 yuan per box, how much profit can the stores make? (3 points)

There is an isosceles triangle garden, the bottom is 25 meters long and 5 meters shorter than the waist. What is the circumference of this nursery? (4 points)