It is known that the solution set of SGN x = {1, x > 0, 2, 0, 3 - 1, X2 is?

It is known that the solution set of SGN x = {1, x > 0, 2, 0, 3 - 1, X2 is?

x>0
Then (x + 1) × 1 > 2
x>1
x=0
Then (x + 1) × 0 > 2
Not established
x2
x+1

What does SGN mean

SGN is sign [` SAIN] Thain
1. Symbolic function in Mathematics
That is 1, x > 0
y=sgnx= 0,x=0
-1,x

What does SGN mean in high numbers?

The SGN function returns an integer representing the sign of a number. The SGN (number) number parameter can be any valid numeric expression. The return value SGN function has the following return values: if number is SGN, return greater than zero, 1 equal to zero, 0 less than zero - 1, indicating that the sign of the number parameter determines the return of the SGN function

Grade 6 Volume 1 mathematics evaluation manual 40 pages
In shopping malls, the price of a refrigerator is 2 / 7 (two seventh) higher than that of an air conditioner. It is known that the price of an air conditioner is 1400 yuan lower than that of a refrigerator. What are the prices of an air conditioner and a refrigerator?

Refrigerator: air conditioner = 9:7
9-7 = 2
1400 / 2 = 700 yuan
700 * 9 = 6300 yuan Refrigerator
700 * 7 = 7900 yuan air conditioner

General solution of equation (x + y) DX - (Y-X) dy = 0

∵（x＋y）dx－（y－x）dy＝0,
∴xdx＋ydx－ydy＋xdy＝0,
∴2xdx－2ydy＋2（xdy＋ydx）＝0,
∴d（x^2）－d（y^2）＋2d（xy）＝0,
∴d（x^2－y^2＋2xy）＝0,
∴x^2－y^2＋2xy＝C.
The general solution of the original differential equation is: x ^ 2-y ^ 2 + 2XY = C

As shown in figure (1), cut a rectangle (M > n) with length m and width n along the dotted line and splice it into figure (2) to form a large square after removing a small square from a corner. Then the side length of the removed small square is ()
A. m−n2B. m-nC. m2D. n2

Let the side length of the removed small square be x, then: (n + x) 2 = Mn + X2, the solution is: x = m − N2

To celebrate the June 1 children's day, the children's palace painted the same 8 cylindrical pillars in the auditorium, the bottom circumference of each column is 3 14m, and the height is 5m
How many square meters of paint do you need?

3.14x5x8 = 125.60m2

How to fill in the operation symbols for 7,3,3,7? The result is equal to 24

7×（3+3÷7）=24

Find the general solutions DX / dt = y, dy / dt = 2x + y for the following agenda groups

It's simple. It's reduced to X / T = y, Y / T = 2x + y, so x / T / T = 2x + X / T, x = 2xtt + XT, so 1 = 2tt + T, so t = - 1, t = 1 / 2
OK

What is 1 + 2 + 3 +... + 2001 + 2002 + 2003 + 2002 + 2001 +... + 3 + 2 + 1?

Square of 2003
because
=（1+2002）+（2+2001）+...+(2002+1)+2003
2003 in total