What is the sign of SGN in mathematics? What is its significance?

What is the sign of SGN in mathematics? What is its significance?

sgn（x）= 1 ,x>0
0 ,x=0
-1 ,x

How to read the mathematical symbol SGN

SGN is the abbreviation of sign
Sign
It means "symbol"
Sin is short for sine,
It's called sine
Represents "sine"
They sound the same

Math problem 12 - (9-y) = 5 (y-4) - 7 (7-y)

12-(9-y)=5(y-4)-7(7-y)
12-9+y=5y-20-49+7y
5y+7y-y=12-9+20+49
11y=72
y=72/11
Y = 72 / 11

Given that the point P is in the second quadrant, its distance from the X axis is 4, and its distance from the Y axis is 5, then the coordinates of the point P symmetrical about the Y axis are

P is in the second quadrant, and its distance to the x-axis is 4, and its distance to the y-axis is 5
So p (- 5,4)
The coordinates of the point P which is symmetric about the Y axis are p '(5,4)

A cylindrical reservoir with a bottom radius of 10 meters can store 1570 cubic meters of water. If the depth of excavation is 2.5 meters, it will be very difficult
Hurry, hurry. There's no time.

Bottom area of pool: 3.14 * 1 * 10 = 314 square meters
Height of pool: 1570 / 314 = 5m
Height after excavation: 5 + 2.5 = 7.5m
After excavation, the pool can store water: 314 * 7.5 = 2355m3

1 4 5 6 is 24 o'clock

5 times 4 times 6 of 1
6/（5/4-1）
(the one above: 1. Divide 5 by 4, 2, 5 by 4 minus 1, 3, 6 by the above)

Finding monotone interval and extremum of F (x) = 2x ^ 3-3x ^ 2

A:
f(x)=2x^3-3x^2
Derivation:
f'(x)=6x^2-6x
Second derivation:
f''(x)=12x-6
The solution f '(x) = 0 is: X1 = 0, X2 = 1
X1, f '(x) > 0, f (x) increases monotonically
0

4500 ml = () CC = () CDM

4500 ml = (4500) cm3 = (4.5) DM3

The front view of a geometry. The side view is a circle with a diameter of 1, and the top view is a square with a side length of 1

Mou He Fang gai

If you translate the parabola y = x2 two units to the left and then one unit to the down, you can get

Rule: left plus right minus, top plus bottom minus
(left and right translation is x, in brackets, left plus right minus; up and down translation is y, out of brackets, up plus down minus)
According to this rule, we can get a new analytic formula: y = (x + 2) &# 178; - 1