The known function y = (2m + 1) x + M-3 (1) If the function image passes through the origin, find the value of M (2) If it is a first-order function and Y decreases with the increase of X, the value of M is obtained

The known function y = (2m + 1) x + M-3 (1) If the function image passes through the origin, find the value of M (2) If it is a first-order function and Y decreases with the increase of X, the value of M is obtained

(1)m-3=0
m=3
(2)2m+1

Geometry (12 19:44:37)
In the regular pentagon ABCDE, the diagonals AD and CE intersect at point F, and the degrees of angle AED and angle AFE are calculated

Connecting diagonal lines (forming a five pointed star)
Note that the intersection of BD and CE is Q
Then angle qeb + angle QBE = angle eqd (the outer angle is equal to the sum of two non adjacent inner angles)
Similarly, angle fac + angle FCA = angle CFD
From the above two formulas, the sum of the five angles of the pentagram is equal to the sum of the internal angles of the triangle DFQ, equal to 180 degrees
So the angle fdq is 180 / 5 = 36 degrees
Because the angle DFQ is equal to the angle DQP
So angle DFQ = angle DQF = (180-36) / 2 = 72 degrees
Angle AFE and angle DFQ are opposite vertex angles
So the angle AFE is 72 degrees
At the same time, because it is a regular pentagon
Angle FDE = angle fed = (180-72) / 2 = 54 degrees
Angle AED = angle FDE + angle fed + angle fdq = 54 * 2 + 36 = 144 degrees

Sales problem of linear equation with one variable
How much is the cost of a certain overcoat when it is sold at a 20% discount and the profit is 80 yuan?

400 yuan!
X is the cost, and the equation is as follows:
X*（100%+50%）*80%=X+80
X =400
That's easy!

2 / 3T = 3 / 2 the coefficient of the unknown is changed to x = 1. Right

2/3t=3/2
t=3/2 ÷2/3
t=3/2×2/3
t=1

How to solve the equation of 5x + 4x = 99?

5x+4x=99
9x=99
x=11

Factorization factor 2A & #178; + 2ab-3a-3b

2a²+2ab-3a-3b
=2a(a+b)-3(a+b)
=(a+b)(2a-3)

Y = √ 3sinxcos x-cos Λ 2x, when x ∈ [0, half pie], find the maximum and minimum value and phase of the function
Y = √ 3sinxcos x-cos Λ 2x, when x ∈ [0, half school], find the maximum and minimum value of the function and the corresponding x value,

y=√3sinxcosx+cos^2x =(√3/2)sin(2x)+[1+cos(2x)]/2 =(√3/2)sin(2x)+(1/2)cos(2x) +1/2=sin(2x+π/6) +1/2
pi/6 < 2x+π/6

What is the difference between the quadratic y of the binomial 3x and the quadratic X of the binomial - 5Y?

The second power of 3x y plus the second power of 5Y X has no actual value minus a number, which is equal to the opposite of this number

Given the square of a + 2 + 10 (B-3) = 0, find the value of 3a-2b

That is, a + 2 = 0
a=-2
b-3=0
b=3
3a-2b
=3×-2-2×3
=-6-6
=-12

(1) Given 2x + 30 = 56, then 4x + 50 = ()
(2) If a * 5 = b * 2, then a: B = (): ()

1) From 2x + 30 = 56, we get 2x = 26,
So 4x + 50 = 102
2) If a * 5 = b * 2, then a: B = (2): (5)