The following is an unfinished formula. Insert some brackets and operation symbols between the numbers on the left side of the equation to make the equation hold: 1 23 4 5 6 7 8 9 = 72

The following is an unfinished formula. Insert some brackets and operation symbols between the numbers on the left side of the equation to make the equation hold: 1 23 4 5 6 7 8 9 = 72

1+2-3+4-5-6+7+8*9=72

Given that f (x) = root sign (AX & # 178; - ax + 4) holds for any x, find the value range of a?
Δ=a²-16a

If the function image cannot be below the x-axis, then Δ = A & # 178; - 16A ≤ 0
The values under the root sign are all ≥ 0
If a = 0, the root sign is 4

If the image of the function y = (2x + 1) / (3x + a) is symmetric with respect to the line y = x, then a=

In other words, its inverse function is itself
Inverse function
x=(2y+1)/(3y+a)
2y+1=3xy+ax
y=(1-ax)/(3x-2)
a=-2

Four digit ABCD multiplied by 9 equals four digit DCBA. What are these four digits?

1089×9=9801

If point a (2, m) is on the image of function y = 3x, then the coordinates of the symmetric point of point a about V axis are____ .
It is helpful for the responder to give an accurate answer

A（2,6)
The coordinates of the symmetric point a about X axis are (2, - 6)
The coordinates of the symmetric point a about the Y axis are (- 2,6)

The radius of the bottom surface of a cylinder is 5 decimeters, the side area is 188.4 square decimeters, and the volume is how many cubic decimeters?
Use numbers, don't use RS, etc

2 * 3.14 * 5 = 31.4 decimeters (bottom perimeter)
18.84 / 31.4 = 6 decimeters (height)
3.14 * 5 * 5 * 6 = 471 cubic decimeter (volume)

3 13 6 9 is 24 o'clock

6/3+9+13=24

Let P = e ^ (AB) and a > 0 be the polar coordinate equation of the curve, then the area of the arc and polar axis on the curve corresponding to B changing from 0 to 2 π is 0______
I want to know what the equation is. I'm not sure. I know how to do it. It's the equation of polar coordinates for area

ρ = e ^ (a θ) θ changes from 0 to 2 π
S=(1/2)∫(0,2π)e^(2aθ)dθ

Square meters, how to convert into Mu and Fen?

1 mu = 666.67 square meters = 10 points; 1 point = 66.67 square meters
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The three views of a geometry are shown in the figure, where △ ABC in the front view is an equilateral triangle with side length of 2, and the top view is an equilateral hexagon. Calculate the area of the side view of the geometry

This geometry is a regular hexagonal pyramid, and the projection of its vertex on the bottom is the center of the bottom. Because △ ABC in the front view is a regular triangle with side length of 2, and its height is 3, that is, the height of the triangle in the side view is 3, and the distance from the center to the side is 32, so the bottom length of the triangle in the side view is 3, so the area of the side view is 12 × 3 × 3 = 32