There are 5 good students in Grade 6 class 61, accounting for one ninth of the class. There are () students in the class

There are 5 good students in Grade 6 class 61, accounting for one ninth of the class. There are () students in the class

45 people, 5 divided by 1 / 9 = 45

Children's day three good student three good student, the number of boys and girls is 4 to 5., 180, how many boys and girls are there?
Be careful

4+5=9
Boys: 180 * (4 / 9) = 80
Girls: 180 * (5 / 9) = 100

Comparing the positive proportion function y = KX + B with the inverse proportion function y = K / x with the point a, B, we prove that a and B are symmetric points about the origin
The two K's are different

I write y = K / X as y = A / X
So KX + B = A / X
So KX ^ 2 + bx-a = 0
So X1 + x2 = - B / K
Because y = KX + B is a positive proportional function
So B = 0
So X1 + x2 = 0
So X1 = - x2
So Y1 = - Y2
So a and B are symmetric points about the origin

What is the distance | ab | = between two points a and B representing X and - 1 on the number axis? If | ab | = 2, what is x

According to the distance formula between two points, ab = | X - (- 1) | = | x + 1 |
If AB = 2, then | x + 1 | = 2, that is, x + 1 = 2 or x + 1 = - 2, that is, x = 1 or x = - 3

Can probability theory P (xy = 1) deduce P (x = 1, y = 1)

P (xy = 1) does not mean that P (x = 1, y = 1) = 1, because 1 can be the product of other numbers. For integer x, YP (xy = 1) = P (x = 1, y = 1) + P (x = - 1, y = - 1), if x = 2, y = 1 / 2m, XY is also equal to 1, that is to say, XY is reciprocal to each other - > x, y are all equal to 1. Do you think that's right

What is the pronunciation of Sinh in the function?
Same topic
Note that Sinh is not sin

Sin is the abbreviation of sine in English, so the pronunciation is [SAIN]
Six trigonometric functions
Sin sine [SAIN] sine
Cos cosine [kou'sain] cosine
Tan (TG) tangent ['tand З ent] tangent
Cot (CT) cotangent [Kou't and З ent] cotangent
SEC secant ['si: Kant] secant
CSC cosecant [kou'si: Kant] cosecant

How much is 76 times 9 out of 75 plus 74 times 8 out of 75

76×9/75+74*8/75
=(75+1)×9/75+(75-1)*8/75
=75*9/75+9/75+75*8/75-8/75
=9+8+1/75
=17 and 1 / 75

A parallelogram has an area of 8 / 9 square meters and a height of 2 meters. How many meters is the bottom of the parallelogram

Bottom length
=Area / height
=8 / 9 / 2
=4 / 9 (m)
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The vertex coordinates of an image with quadratic function y = x square - 2x are_____

(1,-1)
The vertex formula is y = (x-1) ^ 2-1

If 2x ″ - (4m-1) x + 2m ″ + 1 (″ means square) is a complete square expression, find the value of M

Let 2x ^ 2 - (4m-1) x + 2m ^ 2 + 1 = (AX + b) ^ 2 = a ^ 2x ^ 2-2abx + B ^ 2
Comparison coefficient
2=a^2
1-4m=-2ab (1)
2m^2+1=b^2
(1)^2 4m-1=2ab ,16m^2-8m+1=4a^2b^2
16m^2-8m+1=4(2)(2m^2+1)
16m^2-8m+1=8(2m^2+1)=16m^2+8
-8m+1=8
8m=-7
m=-7/8