How to solve the equation of 2 / 3-x = 4 / 5

How to solve the equation of 2 / 3-x = 4 / 5

2 ／3﹣x＝4／5 10﹣15x＝12 x＝-2／15

If the equation 3-x = - a about X has the same solution as 1 / 3 (x + 5) - 5 = 2, find the value of A
Note that 3-x = - A is negative on the right=

3-x=-a
1/3(x+5)-5=2
x+5-15=6
x=16
3-16=-a
a=13

What is the meaning of set C = = {(x, y) / y = x} expressed in words? What is the meaning of set D = {(x, y) / {2x-y = 1, x + 4Y = 5} expressed in words?
What's the relationship between the two?

What is the meaning of the set C = {(x, y) / y = x} expressed in words?
Represents the set of all points on the line y = X
What is the literal meaning of the set D = {(x, y) / {2x-y = 1, x + 4Y = 5}?
Denotes the intersection of two lines 2x - y = 1 and X + 4Y = 5
The solution shows that the intersection point is (1,1) on the line y = X
So, set C is contained in set D

If the polynomial x2 + 2mx + 64 is a complete square, then M=______ ．

∵ x2 + 2mx + 64 is a complete square form, ∵ 2mx = ± 2 · x · 8, ∵ M = ± 8

As shown in the figure, in △ ABC, ab = AC, EF is the median line of △ ABC, extend AB to D, make BD = AB, connect CD, prove: CE = 1 / 2CD

∵ AB = AC, e, f are the midpoint
∴AE=AB/2=AC/2=AF
∵AE=AF,∠A=∠A,AC=AB
∴△EAC≌△FAB(SAS)
∴CE=BF
∵AF=FC,AB=BD
∴BF∥CD
And BF = CD / 2
∴CE=CD/2

Seeking the cubic power of (x + y) - the quadratic power of Y (x + y) + the quadratic power of X (y + x) = () (2x + y)

(x + y) - Y (x + y) + X (y + x) = (x + y) [(x + y) - Y (x + y) + x] = (x + y) (x + 2XY + y-xy-y + x) = (x + y) (2x + XY) = the third power of X (x + y) (2x + y) = (x + XY) (2x + y) (x + y) - the second power of Y (x + y) + the second power of X (y + x) = (x + XY) (2X + y)

How to use electric cooker to cook?
For example, how to wash rice? How much rice? How much water? How long to cook? How well cooked? Taste the best?
And how to choose rice? How to identify good rice and bad rice? Generally 1-4 people eat, when I'm alone, the majority, the average amount of rice, small bowl two bowls

1. Soaking rice for at least 15 minutes can remove harmful substances from rice
2. When steaming rice, as long as you add some vinegar, the steamed rice will be white, sticky and fragrant
3. Add a few drops of vegetable oil
4. Put the right amount of water, about four to five centimeters higher than rice, about the index finger inserted into the meter, the water about to the middle of the index finger joint so deep
5. If the rice has not been soaked, the water in the pot is about 3mm higher than that in the pot. If the rice has been soaked, the water is 2mm higher than that in the pot
6. As for how much rice to put, it depends on how much you usually eat, and then put half of the raw rice on the line
7. Practice makes perfect. Try it. Come on

Known sets a = {x | - x ^ 2 + 4x + 5 > 0}, B = {x | - x ^ 2 > 16}, C = {x | - x ^ 2 + X + 1 > 0}
(1) Finding a intersection B, a union B, B intersection C
(2) Finding the intersection of a (CCB)

A={x|-x^2+4x+5>0},x^2-4x-5

The input of refrigerator is electric energy, so what is the output energy?

The final result is the temperature change, because there is something inside the chemical reaction, is the chemical energy - not quite sure

X of a, y of B

x/a=bx/ab
y/b=ay/ab