What angle is flat angle minus acute angle equal to

What angle is flat angle minus acute angle equal to

Flat angle minus acute angle equals obtuse angle

What angle is a flat angle minus an obtuse angle equal to

Acute angle

If the polynomial 2 multiplies x plus 1 and multiplies 5 multiplies x minus m, then what is m equal to
The coefficient of the first term is 1

（2x+1）×5（x-m）
=10 x square + (5-10m) x-5m
Because the coefficient of the first term is 1, the solution of 5-10m = 1 is m = 1 / 2

How to judge the period and symmetry axis by F () = f (), for example, f (a + x) = f (A-X) symmetry axis is a
How to judge the period and symmetry axis of function by F () = f (), for example, f (a + x) = f (A-X) symmetry axis is a and F
() = - f () and even and odd functions. What are the special methods to judge the period and axis of symmetry

F (x) and f (- x) are symmetric about the Y axis
F (x) and - f (x) are symmetric about X axis
F (x) and - f (- x) are symmetric about the origin
F (x) and f '(x) are symmetric with respect to y = X
F (x-a) and f (A-X) are symmetric about the Y axis
F (x + a) and f (A-X) are symmetric with respect to x = a
F (x) and y = 2b-f (2a-x) are symmetric with respect to point (a, b),
Mathematical and chemical formula 17 pages, have a look

If the formula √ 2x + 1 is meaningful, then the value range of X is?

X is not equal to - 1 / 2

It is known that the exponent of equation (A-2) x is the absolute value of a - 1 = 3 is a linear equation of one variable about X, and the value of a is requested

If the equation of one variable is linear, then the exponent of X is equal to 1, which means that | a | - 1 = 1, then | a | = + 2 or - 2
A = + 2 to get 0 = 3 is meaningless
So a = - 2

Mathematical Olympiad problem solving (20-x) * 120-80x = 220 (16-x) * 1.2-0.4x = 1.6 5x-10 = (x + 4) * 2
It's an equation

(20-x)*120-80x=2202400-120x-80x=220120x+80x=2400-220200x=2180x=2180/200x=10.9(16-x)*1.2-0.4x=1.619.2-1.2x-0.4x=1.61.2x+0.4x=19.2-1.61.6x=17.6x=17.6/1.6x=115x-10=(x+4)*25x-10=2x+85x-2x=10+83x=18x=18/3x...

Given a ^ 2-5A + 1 = 0, the value of fraction a ^ 2 / (a ^ 4 + A ^ 2 + 1) is

a^2-5a+1=0===>a^2=5a-1====>a^4=(5a-1)^2=25a^2-10a+1a^2/(a^4+a^2+1)=(5a-1)/[(25a^2-10a+1)+(5a-1)+1]=(5a-1)/(25a^2-5a+1)=(5a-1)/[25(5a-1)-5a+1)]=(5a-1)/120a-24=1/24

3x-3x merge congeners
Such as the title

3x-3x = (3-3)x = 0 * x = 0

The proof of simple point that determinant of positive definite matrix is less than or equal to diagonal product

This problem should be proved by mathematical induction
The following contents should be used in the process of proof:
First, the matrix of order n is positive definite, and an-1 is positive definite of order n-1
Second, if a is positive definite, then a is inverse positive definite
Let's take a look at the order of the main and sub forms of an, A1, A2,... An-1, an
Mathematical induction vs. n induction
A1 = a11, the condition is satisfied
When n-1, if an-1