-The sum of 11 and - 6 is larger than 4 () 2. The result of calculating (- 3) - (+ 5) + (- 7) - (- 5) + two and one third is () 3. The following statement is true: a minus two negative numbers equals absolute value minus B. the difference between the two numbers must be greater than 0. C minus positive numbers equals two negative numbers plus D minus negative numbers and two positive numbers minus 4. If | A-1 | + | B + 3 | = 0, then the value of b-a-1 / 2 is 0 5.-7-（-21）= ；（-38）-（-24）-（+65）= 6. A, B and C are respectively - 13 m, - 7 m and - 20 m relative to the sea level, so the highest place is () m higher than the lowest place From - 35, add 1 step by step to get a series of integers: - 34, - 33, - 32, - 31 (1) What is the 50th integer in the string? (2) find the sum of the 50th integers? 0+1-【（-1）-（-3/7）-（+5）-（-4/7）】+|-4| -1/2-5 1/5-1+3 1/4-4.5=2 1/3 In order to avoid radar tracking, a submarine went down from 45 meters to 24 meters, rose 34 meters, and then went down 20 meters? 10. The positions of rational numbers a, B and C on the number axis are shown in the figure ------------------------------------------→ a c 0 b (1) Simplification: | A-B | + | a + C | - | B-C | + | 2C |; (2) When a = - 3, C = - 2, find the value of the above formula

-The sum of 11 and - 6 is larger than 4 () 2. The result of calculating (- 3) - (+ 5) + (- 7) - (- 5) + two and one third is () 3. The following statement is true: a minus two negative numbers equals absolute value minus B. the difference between the two numbers must be greater than 0. C minus positive numbers equals two negative numbers plus D minus negative numbers and two positive numbers minus 4. If | A-1 | + | B + 3 | = 0, then the value of b-a-1 / 2 is 0 5.-7-（-21）= ；（-38）-（-24）-（+65）= 6. A, B and C are respectively - 13 m, - 7 m and - 20 m relative to the sea level, so the highest place is () m higher than the lowest place From - 35, add 1 step by step to get a series of integers: - 34, - 33, - 32, - 31 (1) What is the 50th integer in the string? (2) find the sum of the 50th integers? 0+1-【（-1）-（-3/7）-（+5）-（-4/7）】+|-4| -1/2-5 1/5-1+3 1/4-4.5=2 1/3 In order to avoid radar tracking, a submarine went down from 45 meters to 24 meters, rose 34 meters, and then went down 20 meters? 10. The positions of rational numbers a, B and C on the number axis are shown in the figure ------------------------------------------→ a c 0 b (1) Simplification: | A-B | + | a + C | - | B-C | + | 2C |; (2) When a = - 3, C = - 2, find the value of the above formula

-21
-23/3
C
-9/2
14 -79
thirteen
15 -475
55 meters underwater is actually 10 meters in the original position
（b-a）+(-a-c)-(b-c)+(-2c)=-2a-2c
ten

Junior high school Chinese synchronous reading and outward bound
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New curriculum standard synchronous unit practice Mathematics Grade 8 Volume 1 Chapter 5 test paper

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New curriculum standard synchronous unit exercise grade 8 Volume 2 final test volume 2

1. In the following sentences, what belongs to the proposition is (d) A. extend the line AB to C. B. find the arithmetic square root of 9. C. are all positive numbers greater than zero? D. the same position angle is equal. 2

Given the diameter ab of a circle, point C is on the circle, O is the center of the circle, OC ^ 2 = AC * BC, find the degree of angle ABC?

OC²=AC*BC …… (1)
AC² +BC²=AB²=4OC²
(1)×4:4OC²=4AC*BC===>AC²+BC²=4 AC*BC
AC & sup2; + BC & sup2; - 4 ac * BC = 0
Ψ AC = (2 + √ 3) BC, or AC = (2 - √ 3) BC
Let 1. BC = x, AC = (2 + √ 3) x, ab = (√ 2 + √ 6) X
2.BC=X,AC=（2-√3）X,AB=(√6+√2)X
∴1.sinB=（2+√3）/(√2+ √6)=(√6+√2)/4====>B=75º
2.sinB=(2－√3）/(√6－√2)=(√6-√2)/4====>B=15º
The ABC = 75 & ordm; or 15 & ordm;

As shown in the figure, in the triangle ABC, AB is the diameter of the center O, the intersection of the center O and AC at the point D, the angle B is equal to 60 degrees, the angle c is equal to 75 degrees, and the degree of the angle BOD is calculated

As shown in the figure, AB is the diameter of ⊙ o, and points c and D are two points on ⊙ O. if ∠ CDB = 25 °, then ∠ ABC=______ Degree

Connect AC, ∫ CDB = 25 °, ∫ BAC = ∫ CDB = 25 °, ∫ AB is the diameter of ⊙ o, ∫ ACB = 90 °, ∫ ABC = 90 ° - BAC = 90 ° - 25 ° = 65 °. So the answer is: 65

In RT triangle ABC, angle c = 90 degrees, D is the point on BC, De is perpendicular to AB and E, angle ADF = 90 degrees, angle 1 = angle 2

What angles are ∠ 1 and ∠ 2?

In RT triangle ABC, angle c = 90 degrees, D is the point on BC, De is perpendicular to AB and E, angle ADF = 90 degrees, and angle 1 = angle 2

This is a theorem. As long as we prove that ad is the angular bisector of angle a, and that AC is perpendicular to BC, De is perpendicular to AB, then CD = de can be obtained from the theorem. Because I don't know which angle you said angle 1 and angle 2 are, but it should be very simple to prove that D is the angular bisector of angle a! If you still don't understand, you can ask me again, but I hope you think about it yourself. This is a very simple problem,

Triangle ABC is an isosceles right triangle, angle ACB = 90 degrees, D is the midpoint of AC, connecting BD, making angle ADF = angle CDB, connecting CF and crossing BD to E,
Verification of BD vertical CF

Ah ‖ BC is made through point a, and DF is extended to intersect ah with H
∵∠HAD=∠DCB=90°,AD=DC,∠ADH=∠CDB ∴⊿ADH≌⊿CDB﹙ASA﹚ ∠CBD=∠DHA ,AH=AC ;∵AH∥BC ∴∠ACB=∠CAH=90° AC=BC ∠CAF=∠HAF=45° AF=AF
In ≌ AFC ≌ ⊿ AFH ≌ AHF = ∠ DCF, in ⊿ ahd, ≌ ≌ ⊿ AHF = ∠ DBC = ∠ DCF ∠ ADH = ∠ BDC, ≌ ≌ ≌ ⊿ AFH = 90 ° and ≌ ≌ ≌ ≌ ≌ ≌ ≌ ≌ ≌ ≌ ≌
∴BD⊥CF
Hope to be satisfied and adopt