Solving equation 3 ^ x + 3-3 ^ 2x + 1 = 72 The process is detailed

Solving equation 3 ^ x + 3-3 ^ 2x + 1 = 72 The process is detailed

27*3^x-3*3^2x=72
3^2x－9＊3^x+24＝0
unsolvable

2x-8 = 72, I want to know the solution equation of 2x-8 = 72

2x=80
x=40

Finding the range of the function y = - X & sup2; + 3x + 1 decreasing monotonically

y=-x²+3x+1
=-(x²-3x+9/4)+9/4+1
=-(x-3/2)²+13/4
Function minus interval [3 / 2, + ∞)
Range (- ∞, 13 / 4]

Finding the inverse function of y = sin (x-1)

y=sin（x－1）
x-1=arcsiny
x=arcsiny+1
That is, the inverse function is y = arcsinx + 1

There is a rectangular stadium. If its length and width are increased by 6 meters, the area will be increased by 1236 square meters. What is the perimeter of the original stadium?

Let the original rectangle be x meters wide and Y meters long
Then (6 + x) * (6 + y) = XY + 1236
6 (x + y) = 1200
Then perimeter = 2 (x + y) = 1200 / 3 = 400 (m)

Grade seven mathematics evaluation manual section and thinking of the 12th question, on the strengthening of civic education that question, three small questions are all written out

Sorry, I can't help you, but I advise you to finish it by yourself, or you won't do well in the exam. It's just a suggestion, not a accusation. If you don't want to see it, it doesn't matter

Seeking indefinite integral 1 / root sign (1-2x)

Original formula = - 1 / 2 * ∫ D (- 2x) / √ (1-2x)
=-1/2*∫(1-2x)^(-1/2)d(1-2x)
=(-1/2)*[(1-2x)^(-1/2+1)]/(-1/2+1)+C
=-[(1-2x)^(1/2)]+C
=-√(1-2x)]+C

Rearrange the following letter combinations and add an initial to form a word
1.hsru( ) 2.yugnr( ) 3.aes( ) 4.bbreu( )
5.deir( ) 6.eirt( ) 7.seru( )

brush
hungry
case/base
rubber
rider/wider
liter/writer
purse/nurse

The side view of a cylinder is a square with side length of 6.28 decimeters. The height of the circle is () decimeters, and the bottom area is () square decimeters

2 = 1 (decimeter) radius
3.14 * 1 & # 178; = 3.14 (square decimeter) Floor area
The side view of a cylinder is a square with side length of 6.28 decimeters. The height of the circle is (6.28) decimeters, and the bottom area is (3.14) square decimeters

How to fill in 4 5's, the operation sign is equal to 1,2,

(5+5)÷（5+5）＝1
5÷5+5÷5＝2
5+5－5÷5＝9