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The seventh grade second volume mathematics midterm examination paper.
First, multiple choice questions
1, and the positional relationship between the two straight lines is ()
A, intersection, vertical b, intersection, parallel c, vertical, parallel d, intersection, vertical, parallel
2, as shown in the figure, is a "seven" shape, and ∠ 1 is ().
a、2 B、3 C、4 D、5
3. Draw parallel lines of known straight line A through point A, and you can draw ().
A, 0 b, 1 c, 2 d, uncertain
4. As shown in Figure 4, it cannot be judged that the straight line A/B is () under the following conditions.
a、∠ 1=∠3 B、∠2=∠3 C、∠4=∠5 D、∠2+∠4= 180
5, the following figures are stable ()
A. square B. rectangle C. right triangle D. parallelogram
A transparent box contains balls of the same size. * * * There are four white balls and six red balls. What is the probability of getting a red ball by taking a ball at random? ( )
a、3/4 B、3/5 C、2/5 D、 1/2
7. As shown in the figure, ∠ 1=∠2, ∠ 3 = ∠ 4 and ∠ A = 80, then ∠BOC is equal to ().
A, 95 b, 120 c, 130 d, uncertain.
If A = 1. 1062 and B = 0.947 are rounded approximations, how many significant digits does a*+b* have? ( )
a、4 B、5 C、6 D、7
The following statement is true ()
A. Numbers with opposite signs are opposite.
B. Numbers with opposite signs and equal absolute values are reciprocal.
C. Numbers with equal absolute values are reciprocal.
D, numbers with opposite signs are reciprocal.
10, two skilled workers at the same level need to have three technical competitions, and it is stipulated that the winner is two wins in three games. If A wins in the first game, then the possibility that B will win in the end is ().
a、 1/4 B、 1/3 C、 1/2 D、 1/6
fill-in-the-blank question
In scientific notation, 9349000 (with two significant figures) is _ _ _ _ _.
12. As shown in figure 1, straight lines AB, CD and EF intersect with point O, where antipodal angle is 0 and complementary angle is 0.
13, as shown in Figure 2, to lead the water in the pond to D, you can lead CD⊥AB to D through point C, and then open a canal along CD, which can make the waterway shortest. Please explain the design basis:
Polynomial 4x? +MX+36 is a completely flat mode, so m = _ _ _ _ _ _ _ _ _
15, as shown in the figure, AC shares ∠BAD, ∠DAC=∠DCA, fill in the blanks:
Because AC share ∠BAD, ∠ DAC = _ _ _ _ _ _
And because ∠DAC=∠DCA, ∠ DCA = _ _ _ _ _ _ AB ∨_ _ _ _ _ _.
answer the question
( 1)(2m+n- 1)？ (2) (3a+2b)？ -(3a-2b)？
An ant starts from point O, climbs 2.5cm along 45 north of due east, climbs 3 cm (point C) along 60 north of due west when encountering an obstacle (point B), and draws a crawling route.
answer the question
18 As shown in the figure, the straight line DE intersects with the sides AB and AC of △ABC at D and E, and intersects with the extension line of BC at F. If ∠ B = 67, ∠ ACB = 74, ∠ AED = 48, find the degree of ∠BDF.
19, as shown in the figure, if AB//CD, ∠ B = 37, ∠ D = 37, is BC parallel to DE? Why?
20. As shown in the figure, point B is in the direction of 45 west of South A, point C is in the direction of East of South A15, and point C is in the direction of East of North B..
80 direction, find ∠ACB
2 1, as shown in the figure, point D is the midpoint of BC and point E is the midpoint of AD.
(1) ∠ Abe = 15, ∠ bad = 40, find the degree of ∠BED;
(2) On the delta bed, make the height of BD side.
answer
I. 1-5CBBC
6- 10BCBBB
Second, 1 1, 9.3x 10 6 12, ∠ fob; ∠AFOD 13, and the shortest straight line between two points is14,2415, ∠ cab;
∠ cab; direct current
Iii. 16, (1)4m? +4mn-4m+n？ -2n+ 1 (2)24ab
17, omitted
Iv.18,87
19, parallel
Because AB//CD, ∠ B = 37, ∠ BCD = 37.
Because ∠ D = 37, ∠ D = 37 = ∠ BCD
So BC//Germany
20、85
( 1)55
(2) Omission