The solution of the equation x ^ 2-9x = 0 is The answer is X1 = 0, X2 = 9 Why,

The solution of the equation x ^ 2-9x = 0 is The answer is X1 = 0, X2 = 9 Why,

x^2-9x=0
x(x-9)=0
x1=0 x2=9

How to solve the equation (4 / 9 + 5 / 9) x + 4 / 15 = 4 / 9 + 5 / 9x

The original formula: (4 / 9 + 5 / 9) x + 4 / 15 = 4 / 9 + 5 / 9x (4 / 9) x + (5 / 9) x + (4 / 15) = (4 / 9) + (5 / 9) x (4 / 9) x + (4 / 15) = (4 / 9) (4 / 9) x = (4 / 9) - (4 / 15) = (20-12) / 45 = 8 / 45x = (8 / 45) / (4 / 9) = (8 / 45) x (9 / 4) = 2 / 5, so the solution of the equation is x = 2 / 5

How to solve the equation (x-x / 3-8) * 1 / 3 = 4 / 9x-4.5)

(x-x/3-8)*1/3=4/9x-4.5
（2x/3-8）*1/3=4/9x-4.5
2x/9-8/3=4x/9-4.5
2x-24=4x-40.5
40.5-24=2x
2x=15.5
x=7.75

The equation of x-0.9x = 81.9
I'm in a hurry

X-0.9X=81.9
0.1x=81.9
x=819

The number of positive roots of equation - x2 + 5x-2 = 2x is ()
A. 3B. 2C. 1D. 0

It can be seen from the graph that the image of the function y = - x2 + 5x-2 and y = 2x has two intersections and two positive roots in the first quadrant

The answer to the factorization of a mathematical problem "x ^ 3 + 2x ^ 2-5x-6"
What is factorization

X^3+2X^2-5X-6＝(x+1)(x+3)(x-2)

｛2x/3+4/3y=1/5 6/5x-2/5y=2}

First and second floor error, directly ignored. This view is binary linear equations
Sorting {10x + 20Y = 3 ① 6x-2y = 10 ②}
②*10+①,70X=103 X=103/70
Substituting x = 103 / 70 into ②, 618 / 70-2y = 10
2Y=-41/35
Y=-41/70
So {x = 103 / 70, y = - 41 / 70}
The answer is absolutely correct. I have checked it. Unless you are wrong!

Math problem 1 / 2-2 / 2x-3 = 1 / 6-2x

6-4x on the right
1/2-2/(2x-3)=-1/2(1x-3)
Double 2 (2x-3)
2x-3-4=-1
2x=6
x=3

How to check 3x-2.1 = 1.5 for a slightly complex equation

3x-2.1=1.5
3x=3.6
x=1.2

(9x-7) / (3x-2) -(4x-5) / (2x-3)=1

(9x-7) / (3x-2) can be written as 3-1 / (3x-2) and (4x-5) / (2x-3) can be written as 2 + 1 / (2x-3), so the equation can be reduced to 3-1 / (3x-2) - 2-1 / (2x-3) = 1, that is - 1 / (3x-2) - 1 / (2x-3) = 0, that is to say - (2x-3) = 3x-2, and the solution is x = 1. Note that if there is x = 2 / 3, x = 3 / 2 in the following, we should omit