Binary linear fractional equation Binary linear fractional equation y:(x-80)=5:4 ① 5(x-80) =4y ② x:y:

Binary linear fractional equation Binary linear fractional equation y:(x-80)=5:4 ① 5(x-80) =4y ② x:y:

Inner product = outer product 5 (x-80) = 4Y
There are countless solutions

The solution of fractional equation

Very simple, for example
2-x divided by 3 + x = 1 divided by 2 + 1 divided by X + 3
2【2-X】=3+X+2
X = one third of the negative
It is proved that the value of X is the solution of the original fractional equation

If the solution of the system of equations 5x + 2Y = K + 1 4x + 3Y = 3 satisfies X-Y > 2, then the value range of K is

5x+2y=k+1 (1)
4x+3y=3 (2)
(1)-(2)
x-y=k-2
If X-Y > 2, K-2 > 2
k>4

Simple calculation of 630 * 45 / 45

630*45/45=630*1=630

If a straight line is drawn through the point P (1,2) and its inclination angle is twice that of the straight line L: x-y-3 = 0, then the equation of the straight line is______ ．

Let the inclination angle of the straight line l be α and α ∈ (0, π 2) ∪ (π 2, π). First, according to x-y-3 = 0, the slope of the straight line is 1, and according to the slope k = Tan α = 1, α = 45 degrees. Because the inclination angle of the straight line is 2 α = 90 degrees, the straight line is perpendicular to the X axis and passes (1, 2), so the equation of the straight line is x = 1, so the answer is x = 1

What is the basis for getting 3x = 10-5 from 3x + 5 = 10?

Add or subtract a number on both sides of the equation, the equation still holds

Known P: - 4

The answer should be - 1 ≤ a ≤ 6
When a = - 1, not p is x > = 3 or x = 3 or X

The following questions can be calculated as simple as possible. (1-4 / 3 × 3 / 2) × 213-13 × 17 / 16)

(3 / 1-4 × 2 / 3) △ 2
=(1-2 / 1) △ 2
=1 / 2
=1 / 4
13-13 × 16 / 17
=13×（1-16/17）
=13×1/17
=13/17

The equation for finding a line L with a circumference of 9 and a slope of - 3 / 4 surrounded by two coordinate axes
It's a process

The slope is - 3 / 4, and the equation can be set as
y-m=-3/4x
The three sides of the triangle are
│m│
│4/3m│
√(m^2+16/9m^2)
Perimeter = │ m │ + │ 4 / 3M │ + √ (m ^ 2 + 16 / 9m ^ 2) = 9
The solution is m = ± 9 / 4
The equation is Y-9 / 4 = - 3 / 4x
And y + 9 / 4 = - 3 / 4x

Simple calculation of 5 / 6 times 2 / 3 plus 7 / 6 times 2 / 3 minus 2 / 3
5 / 6 times 2 / 3 plus 7 / 6 times 2 / 3 minus 2 / 3 simple calculation (2 / 3 minus 1 / 2) divided by (3 / 4 minus 2 / 3)

Five sixths by two thirds plus seven sixths by two thirds minus two thirds
=（5/6+7/6-1）×2/3
=1×2/3
=2/3
(2 / 3 minus 1 / 2) divided by (3 / 4 minus 2 / 3)
=（2/3×12-1/2×12）÷（3/4×12-2/3×12）
=（8-6）÷（9-8）
=2