Mathematics midterm review test for Grade 7 (2) I want the choice of this paper and fill in the blanks

Mathematics midterm review test for Grade 7 (2) I want the choice of this paper and fill in the blanks

1、 (a) the acute angle is less than (b) the obtuse angle is greater than and less than (c) the right angle is greater than the acute angle (d) the angle is also an acute angle, Two students from each group were selected for the survey. (b) there are 40000 graduates in the city taking the senior high school entrance examination. In order to analyze the test papers, the math scores of 500 randomly selected candidates were counted. (c) in order to check the passing rate of a batch of products, one product in each box was selected for inspection. (d) in order to understand the situation of the whole class students completing their homework, The head teacher checked the homework of all subjects of the class. 3. The correct one is () (a) a - (B-C) = a-b-c (b) a - (B-C) = a + B-C (c) a - (B-C) = a + B + C (d) a - (B-C) = A-B + C 4. As shown in the figure, if points B, O and D are on the same straight line, then the degree of ∠ 2 is () (a) (b) (c) (d) 5. If a and B represent two unequal numbers respectively, and a + B = 7, A × B = 6, then the numbers represented by a and B are respectively (). (a) a = 2, B = 5 (b) a = 1, B = 6 (c) a = 2, B = 3 (d) a = 3, B = 46. The correct numbers of the following statements are: (1) a vertical line can be drawn through a point on the line or outside the line; (2) a straight line through a point on the line L and a point B outside the line L, so that it is perpendicular to the line L; (3) a vertical section of the line is made from a point outside the line, It is called the distance from this point to this line; 4. Draw a vertical line of this line through a point outside the line, and the length of the vertical line is called the distance from this point to this line. (a) 1 (b) 2 (c) 3 (d) 47, Then a + B must be () (a) polynomial of degree six (b) polynomial of degree three (c) polynomial of degree not less than degree three (d) integral of degree not more than degree three; ④ The bisectors of adjacent complementary angles are perpendicular to each other. The correct number is () (a) 1 (b) 2 (c) 3 (d) 49. In the following statements: ① there is only one intersection point when two lines intersect; ② two lines do not necessarily have a common point; ③ line AB and line Ba are two different lines; ④ two different lines cannot have two or more common points, Among them, the correct one is () (a) ① ② (b) ① ④ (c) ① ② ④ (d) ② ④ 10. Multiplication of several rational numbers not equal to 0, the sign of product () (a) is determined by the number of factors (b) is determined by the number of positive factors (c) is determined by the odd or even number of negative factors (d) is determined by the size of negative factors, The correct proposition is () (a) ray AB and ray Ba are the same ray (b) has a common vertex and two equal angles are opposite to the vertex angle (c) passing through a point outside the line, and only one line is parallel to the line (d) the two lines are cut by the third line, (a) 3.14 is not a fraction. (b) positive and negative integers are collectively referred to as integers (c) positive and negative integers are collectively referred to as rational numbers (d) integers and fractions are collectively referred to as rational numbers 14. Draw a vertical line of a line segment, perpendicular to the end of (b) line segment on (a) (C) (a) there are three negative numbers greater than - 3. (b) the number greater than - 2 is - 5 (c) the number smaller than 2. The number of 5 is - 3 (d) the number smaller than - 3. The number of 2 is - 1 2. Fill in the blanks (2 points for each sub question, 30 points in total) 1. Read as or read as, and the sum of them is______ They are surrounded by two faces, and their intersection line is_________ ． 3. =______ 4. The number of 4 unit length from the origin on the number axis is___ And___ , they____ Please write the opposite number of A_______ 7. On June 10, 2003, the Mars rover Spirit was launched from Cape Canaveral Air Force Base of the United States. It completed 480 million kilometers of star trek in 206 days and nights under the propulsion of the carrier rocket, and successfully landed on the surface of Mars at 10:50 on January 4, 2004__ When two students stand together to compare the height, they are actually comparing the length of two lines_______ 9.43 million, with a significant number, they are. 10_______ (the answer is related to mathematical knowledge) 11. Calculation: (1) (10) × (+ =; (2) (5.8) × (1.84) =. 12. Judgment: (1) a × (B + C) = a × B + a × C () (2) a △ B + C) = a △ B + a △ C () (3) (a + b) △ C = a △ C + B △ C () (4) a × (B × C) = a × B × C () (5) a △ B × C) = a △ B × C () (6) a △ B △ C) = a △ B △ C () 13. A line segment is a graph of finite length, and its length can be measured_______ ,_______ And_______ The length of is infinite=_____ It is necessary to arrange polynomials in descending order of the letter X____________ Calculation: 2. (1) write the polynomial as the difference between the monomial and binomial; (2) write the polynomial as the sum of two binomial; (3) add brackets in the polynomial m4-2m2n2-2m2 + 2n2 + N4: ① combine the quartic terms in the brackets with "+"; ② combine the quadratic terms, 3. Use a simple method to calculate (1) 0 - [73 + (- 219) - 81]; (2) - 3 + 12-7 + 8-31-9; (3) - 5-5-5-5-5-5-3-3-3-3; (4) 0 + 1 - [(- 1) - (-) - (+ 5) - (-)] + | - 4 |. 4. Count the number of parallelograms in the figure below. 5, If - 2axbx + y and are of the same kind, find the value of the polynomial. 7. The height of 12 students in a group is measured as follows (unit: cm): 162160157156164169153161155166159. Try a simple method to calculate the average height of the students in the group. (accurate to the tenth) 8. Calculation: (1) 17 - (- 8) / (- 2) + 4 × (- 3); (2) - 12004 - (1 + 0.5) × (-) (3) - 9 + 5 × (- 6) - (- 4) 2 × (- 8). (4) - 22 - [- 5 + (0.2 × - 1) × (-]] 9. The following is the expansion of a cuboid, with letters marked on each face. Please answer the following questions according to the requirements: (1) if face B is above the polyhedron, So which side is below? (2) if e is behind the polyhedron, which side is a from the left, then which side is above? (3) from the right, which side is B, from the top, then which side is in front? (10, According to the requirements, approximate the following numbers: (1) 3.425 (accurate to 0.01); (2) 0.009459 (accurate to the thousandth); (3) 34567 (accurate to the thousandth); (4) 234560 (accurate to the ten thousandth), DD; 2. DD 3. DD 4. C 5. B 6. B 7. D 8. B 9. C 10. C 11. C 12. A 13. D 14. D 15. C 2. Fill in the blanks (2 points for each sub question, 30 points in total) 1. Slightly 2. (2, circle.) 3. - 8 4. 4, - 4, opposite numbers 5. - a 6. 2, 3, 0 7. 4. 8 × 108 8, 4. 3 10. Calculation 11. (1) 2; (2) 10.672 12. (1); (2); (3) ① (m4-2m2n2 + N4) - 2M2 + 2n2; ② m4-2m2n2 + N4 - (2m2-2n2) 3. (1) 227; (2) - 30; (3) - 45; (4) 10 4. 36 5. 6. 7. 160.4cm 8 (1) Original formula = 17-4-12 = 1; (2) original formula = - 1 - ×× (- 4) = - 1 - (- 2) = 1; (3) original formula = - 9-30-16 △ (- 8) = - 9-30 + 2 = - 37. (4) original formula = - 4 - [- 5 + (- 1) / (-)] = - 4 - [- 5 + (-) × (-)] = - 4 - (- 5 + = - 4 + 5 - = (5) original formula = 9. (1) d; (2) B; (3) A 10. (1) 3.43; (2) 009; (3) 35000; (4) 230000

Fill in all the blanks on page 59, page 62 and page 65 of mathematics p57
Comprehensive practice of reading comprehension on page p88, chapter C, chapter E and page 92

The second power of X - 2XY + y (2) the second power of X + 2XY + y 5.8 + 4x-3 * x 6. AB + AC + bc7.28. - 39. (1) the second power of 2A + 3B (2) - 4 * a + 12ab-9 * B 10. (x + 1) (x-1) + 1 = x 11.143 choice

This is our fifth grade next semester mathematics basic training problem, brothers and sisters, please teach me!
"China's real estate development situation and development trend forecast analysis" shows that from 2000 to 2004, the national product house sales price increased by 30%, so the house price in 2004 is the same as that in 2000 (). ① 70%, ② 130% and ③ 30%. Please teach me, by the way, why?

It's increased by 30%, so it's increased by 30%. Teachers should have taught it. The original house price in 2004 is 130% of that in 2000

I've lost my one. As long as it's fast

On Baidu search seventh grade mathematics "homework" midterm test paper

If the ratio of the degrees of the three inner angles of a triangle is 2:3:7, what is the degree of the largest outer angle of the triangle?

Let the trigonometric degrees be 2x, 3x and 7x respectively
Then 2x + 3x + 7x = 180 degree
The solution is x = 15
So the three angles are 30 °, 45 ° and 105 ° respectively
So the maximum outside angle is 150 degrees

The degree ratio of the three internal angles of a triangle is 1:2:6. The triangle must be obtuse______ (judge right or wrong)

1 + 2 + 6 = 9180 × 69 = 120 (degree), answer: this triangle must be obtuse angle triangle, so the answer is: correct

In an obtuse triangle, we know that one acute angle is twice of the other
I'm just the first day of junior high school, otherwise I can't understand it!
Baidu has the answer, but I can't understand, don't be too abstruse!

Let triangle be a, 2a, 180-3a
A

In an obtuse triangle, it is known that one acute angle is twice the other acute angle

0

It is known that in an obtuse triangle, if one acute angle is twice of the other, the degree range of the smaller acute angle is______ ．

Let the smaller acute angle be x degree, then the larger acute angle be 2x degree, ∵ this triangle is obtuse angle triangle, ∵ 0 ＜ x + 2x ＜ 90 °, the solution is 0 ＜ x ＜ 30 °. So the answer is 0 ＜ x ＜ 30 °

In an obtuse triangle, the obtuse angle is twice the other obtuse angle

The obtuse angle is twice the acute angle
If the larger acute angle is B, then the obtuse angle is 2B 〉 90 and B 〉 45 （1）
Let the smaller acute angle be C, and 3b + C = 180 is obtained from B + 2B + C = 180 （2）
(1) (2) Simulink can get C