It is known that on the number axis, the number represented by point a is - 27, and the number represented by point B is - 15. Find the distance between two points a and B It is known that on the number axis, the number represented by point a is - 27, and point B is - 15. Find the distance between two points ab A: the larger number minus the smaller number B: the smaller number minus the larger number C: the absolute value of the difference between the preceding number and the following number D: the absolute value of the difference between the last and the first Mao: draw the number axis and actually count What do you think_____ The plan is not correct The reason is___________ What else can you do______________ What do you think you should pay attention to when calculating the distance between two points?

It is known that on the number axis, the number represented by point a is - 27, and the number represented by point B is - 15. Find the distance between two points a and B It is known that on the number axis, the number represented by point a is - 27, and point B is - 15. Find the distance between two points ab A: the larger number minus the smaller number B: the smaller number minus the larger number C: the absolute value of the difference between the preceding number and the following number D: the absolute value of the difference between the last and the first Mao: draw the number axis and actually count What do you think_____ The plan is not correct The reason is___________ What else can you do______________ What do you think you should pay attention to when calculating the distance between two points?

It is known that on the number axis, the number represented by point a is - 27, and point B is - 15. Find the distance between two points of ab. A: the larger number minus the smaller number B: the smaller number minus the larger number C: the absolute value of the difference between the former number minus the latter number d: the absolute value of the difference between the latter number minus the former number d: draw the number axis, and actually count a number__ B___ The solution is

The problem of probability theory is to find the probability density
Let the probability density of random variable X be
F (x) = 2x / (square of PI), 0

When 0

How to expand sin (2x) * cos (x) + sin ^ 2 (x) into an expression of sin (x), or how to simplify it?

The original formula = (2sinxcosx) cosx + Sin & # 178; X
=2sinx*cos²x+sin²x
=2sinx*(1-sin²x)+sin²x
=-2sin³x+sin²x+2sinx

How much is a + B = 3 AB = - 7 / 4 for A-B? A + B = 3 AB = - 7 / 4 for a ^ 1 / 2 + B ^ 2?

a+b=3 ab= -7/4
Can get
（a-b）²=（a+b）²-4ab=16
a+b=±4
A ^ 1 / 2 + B ^ 1 / 2
=1/a²+1/b²
=（a²+b²）/a²b²
=（a+b）²-2ab /(ab)²
=12.5/ 49/16
=12.5*16/49
=200/49
Typing is very hard. Give me a point. I've typed it all

Circle and parallelogram, how to draw a straight line, at the same time, the two figures are divided into two parts of the same size. And say that this line divides the circumference of the two figures
What's the relationship between the two parts
She ate some dumpings for breakfast______ dumplings for breakfast

A straight line connecting the center of a circle and the center of a parallelogram. The circumference is also equal

It is known that the image of the first-order function y = KX + B and the image of the inverse scale function y = 6x intersect at two points a and B. the abscissa of point a is 3, and the ordinate of point B is - 3. (1) find the analytic expression of the first-order function; (2) when x is what value, the function value of the first-order function is less than zero

(1) Let the analytic formula of a function be y = KX + B, when x = 3, y = 2, that is a (3, 2); when y = - 3, x = - 2, that is B (- 2, - 3). Substituting points a and B into y = KX + B, 3K + B = 2, - 2K + B = - 3, the simultaneous equations are solved, k = 1, B = - 1, then y = X-1. (2) when y < 0, X-1 < 0, that is x < 1

If the square of 4 x minus MXY plus 1 is a complete square, find M

mx=+-2*2x*1=+-4x
M = 4 or M = - 4

An isosceles right triangle, a waist length of 3.4 decimeters, the area of this triangle is () square decimeters

3.4*3.4/2=5.78

Let F1 and F2 be the two focuses of hyperbola x2a2 − y2b2 = 1 (a > 0, b > 0). If F1, F2 and P (0, 2b) are the three vertices of an equilateral triangle, then the eccentricity of hyperbola is______ ．

Let F1 (- C, 0), F2 (C, 0), then | f1p | = C2 + 4B2, ∵ F1, F2, P (0, 2b) are the three vertices of an equilateral triangle, ∵ C2 + 4B2 = 2c, ∵ C2 + 4B2 = 4C2, ∵ C2 + 4 (c2-a2) = 4C2, ∵ C2 = 4a2, ∵ E2 = 4, ∵ e = 2

Given z = ln (x + y ^ 2), the second partial derivative of Z is obtained

∂z/∂x=1/(x+y^2),∂z/∂y=2y/（x+y^2）
∂^2z/∂x^2=-1/（x+y^2）^2,∂^2z/∂y^2=[2（x+y^2）-4y^2]/（x+y^2）^2
∂^2z/∂x∂y=-2y/(x+y^2)^2,∂^2z/∂y∂x=-2y/(x+y^2)^2