A simple math problem, very urgent, very urgent

Is it a square of x or a square of x? Aren't there operators like parentheses?

I can't understand the meaning of the title, it's so confusing.

Hello, this is the question to find the surface area, as follows.

Find the box: 2 (4 5+4 3+3 5)=74(cm) and then subtract the base area of the cylinder:

Find the area of the cylinder:

Summing up: A: The paint area is 90 square centimeters.

Box area = 2*(5*4+4*3+3*5) =94Cylindrical base area = pi*(d 2) 2 =

Cylindrical surface area = pi*d*h=

Paint Area = Box Area + Cylindrical Surface Area + Cylindrical Base Area - Cylindrical Base Area (Overlap).

94 + = approx. = approx. = 128 (square centimeters).

Box s1 = 2x (5x4 + 4x3 + 3x5) = 94 cm2

Cylinder upper and lower ground s2 = 2xpix (cylindrical side area s3 =

s1+s2+s3=

It should be the surface area of the cuboid plus the side area of the cylinder plus a base area, 94+

(1), because the probability of choosing each item is the same, so the probability of A choosing the item is 1 10, the probability of B choosing the same item is also 1 10, and C is the same, so the probability of three people choosing one item together should be 1 10 * 1 10 * 1 10 = 1 1000

2): Ask for at least two people, we consider the opposite, and neither of them chooses the same project.

The probability of not choosing the same item is 1 0*1 9*1 8=1 720, so the probability of at least two people choosing the same item is: 1-1 720=719 720

(1).If three people choose the same item experience as event a, then p(a)=1 10 1 10=1 100

2).Just subtract the different grams from 1, so the probability is 1-9 10 8 10=28 100=7 25

Hope it can help you, I'm using a mobile phone, if you have any questions, please send me a message, I can't receive a follow-up o( o

(1) 1 1000 Each item has a 1 in 10 chance of being drawn.

2) 1 - 1 7*8*9 1 minus the probability that all three candidates are not the same.

On the same floor.

1) The probability of three people choosing the same project is 1 10, and there are ten items to choose from, that is, there are 10 possibilities, so the probability of three people choosing the same project experience is p=1 10 * 1 10 * 1 10 * 10 = 1 100

2) First find out the probability of three people choosing different items p1 = 9 10 * 8 10 = 72 100, so at least two of the three people choose the probability of the same item for physical examination p = 1 - p1 = 7 25

1) The shadow length can be set to x

32-x)/20√3 =

The solution is x = 12m

2) The building distance can be set to Y

32-x)/y =

At this point, x = 0

y = 32/tan30o = 32√3m

Suppose A's salary is x

then B's salary is.

c's salary is.

a:b:c= or a:b:c=:9

And because a+b+c=52400

That is: x + solution gets: x = .Pick up the calculator and calculate it yourself.,The basic steps can be solved in this way.。

If a b<0, then a uses this to solve the problem.

The process is as follows: because: -3 5 -8<0

So: -3<5

Suppose there are two numbers a,b, if a-b is less than 0, then a is less than b, and vice versa. Let a=-3, b=5, because -3-5 is less than o, so -3 is less than 5, do you understand?

Compare the size by subtracting a number to see if it is negative. If -3 minus 5 is less than zero, -3 is less than 5, and 5-(-3) is greater than zero, indicating that 5 is greater than -3

This question is too simple, even "life expectancy is 75 years old" tells you, and "which scheme is beneficial to the policyholder", since it is only comparing the two insurance schemes, then you can ignore the "bank annual interest rate".

Option 1: Total payment = 437 * 20 = 8740, total income = 1200 * 15 + 10000 = 28000, difference = 19260

Option 2: Total payment = 750 * 10 = 7500, total income = 1000 + 1050 + ......1700+10000=30250, Difference=22750

I'm thinking that I might get 1200 yuan and deposit it in the bank... Brother Mao, look at it yourself.