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If the positions of nonzero rational numbers a and B on the number axis are shown in the figure, then the following conclusions are correct \ -----|----------|--|--------------- 1、a+b>0; 2、a-b>0 A B 0 / 3、ab0 5、(a+b)(a-b)>0 2 3 4 5
A!
1. Given that a ＜ 0, B ＞ 0, a + B ＜ 0, try to arrange the four rational numbers - A, a, B, - B in the order from small to large
If the absolute values of a > 0, B < 0, a < B, try to arrange the four rational numbers - A, a, B, - B from small to large
3. If a > 0, B < 0, C > 0, reduce the absolute value of 2A + the absolute value of 3B - the absolute value of a + C
4. When - 1 ＜ a ＜ 0, use the ＜ sign to connect a, one of a, - A, - one of A
1.—b>a>—a>—b
2.a-3b-c
1 / 3. A
AB is a rational number. The positions of their corresponding points on the number axis are as shown in the figure. A, a, B, B are arranged from small to large. The correct one is ()________ |_______ |______________ |__ a 0 b A –b＜–a＜a＜b B –a＜–b＜a＜b C –b＜a＜–a＜b D –b＜b＜–a＜a
C
Let a = {x | x2 + ax-12 = 0}, B = {x | x2 + BX + C = 0}, and a ≠ B, a ∪ B = {- 3,4}, a ∩ B = {- 3}, find the values of a, B and C
Let-3 be substituted into the equation: x2 + ax-12 = 0, and a = -1, so a = -1, a = -1, and a = {-3, 4}, let-3 be substituted into the equation: x2 + ax-12 = 0, and a = -1, and a = {-3, 4, 4}, let-3 be substituted into the equation x2 + BX + BX + C = 0, and let 3b-c = 9. Let a ∪ B \8746\8746\\\\\\\-3-3, 4 \8746\\8746\\\\\\\(B-6) 2 = 0 So a = - 1, B = 6, C = 9
How to write the library in English
library
The distance between two points a and B on the number axis is 9 unit lengths. The number corresponding to point a is + 3, and the absolute value of the number corresponding to point B is greater than 6
Then the number corresponding to point B is ()
A.12 B.-9 C.9 D.-12
d
If the function f "X" is equal to the square of - x + 2aX and G is equal to x + 1 / A, both of them are decreasing functions in the interval [1.2], then the value range of A
If the functions f (x) = - X & sup2; + 2aX and G (x) = A / (x + 1) are decreasing functions in the interval [1.2], then the value range of a is f (x) = - X & sup2; + 2aX = - [(x-a) & sup2; - A & sup2;] = - (x-a) & sup2; + A & sup2; this is a parabola with an opening downward, which is called x = a for the axis and (a
Xiao Ming gave up his seat to a nearsighted classmate. We came to the park with relaxed steps and happy mood
RT
Xiao Ming gave up his seat to a nearsighted classmate
We came to the park with easy steps and happy mood
The second sentence should be changed to "we come to the park with happy mood and easy steps"
a. B is any two rational numbers, try to compare: the absolute value of A-B and the size of a-b
Equal or opposite numbers
Find the inverse function of y = [1 - √ (1-2x)] / [1 + √ (1 + 2x)]!
See clearly, subtraction is in the molecular root sign!
y=2/[1+√(1+2x)]-1
2/y+1=1+√(1+2x）
1+2x=4/y*y
y=2/x*x-1/2
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- 3. Proof: no matter what rational numbers a, B, C take, A2 + B2 + C2 AB AC BC must be non negative
- 4. The minimum value of a + AB + b-a-2b
- 5. Given rational numbers a, B satisfy a + b > 0, B
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- 7. Write two rational numbers so that their sum and product are both positive numbers. Please state the sign of two rational numbers
- 8. There is a mistake in the following statement: 1. Any rational number has reciprocal; 2. The product of two reciprocal numbers is 1.3. The sign of two reciprocal numbers is the same Another is that 1 and negative 1 are reciprocal
- 9. If two non-zero rational numbers are opposite to each other, their reciprocal is also opposite to each other Such as the title
- 10. If the product of two rational numbers is 1, then the two numbers are reciprocal; the reciprocal of a is expressed as ()
- 11. Given that point a corresponds to rational number a on the number axis, move a four units to the left, and then one unit to the right to get point B. the rational number corresponding to point B is - 2.5. Then what is a equal to
- 12. If the rational number | a | = a, then the corresponding point of a on the number axis must be () A. Left side of origin B. The origin of the fire C. Right side of origin D. Origin or right side of origin
- 13. If the sum of two rational numbers is zero and the product is zero, then the two rational numbers () At least one of a is zero B both numbers are zero C doesn't have to be all zero D. none of the above is true It is known that the product of two numbers is - 1, one of which is 1.2 and the other is () The product of all integers whose absolute value is not greater than 4 is () If a and 3b are reciprocal, then - 9ab = () 1. It is known that the product of two numbers is - 1, one of which is 1. The other is () 2. The product of all integers whose absolute value is not greater than 4 is () 3. If a and 3b are reciprocal, then - 9ab = ()
- 14. Please give a counter example to prove that the proposition "the same side and inner angle complement each other" is a false proposition
- 15. If AB = BC, then point B is the midpoint of AB, which is a false proposition
- 16. There is a point P in the equilateral triangle ABC. If the distances from point P to points a, B and C are 3, 4 and 5 respectively, what is the degree of ∠ APB
- 17. There is a point P in the equilateral triangle ABC. The distances from point P to vertex a, B and C are 3, 4 and 5 respectively. The degree of angle APB is calculated
- 18. In the triangle ABC, ∠ C = 90 degrees, CD ⊥ AB, ∠ B = 56 degrees, then ∠ DCA
- 19. It is known that the right focus of ellipse C is F1 (1,0), M is the upper vertex of ellipse C, and O is the coordinate It is known that the right focus of the ellipse C: a squared x squared + B squared y squared = 1 (a > b > 0) is F1 (1,0), M is the upper vertex of the ellipse C, O is the coordinate origin, and the triangle OMF is an isosceles right triangle. (1) the equation for finding the ellipse C (2) whether there is a straight line L intersecting the ellipse at P and Q, and the point F is the perpendicular center of the triangle PQM, Find the equation of the straight line L; if it doesn't exist, explain the reason
- 20. In the triangle ABC, the opposite sides of the angle a.b.c. are a.b.c. and satisfy that a square plus b square plus a must be equal to C square to find the angle C