A few super easy math problems, forgot how to do it

1: Do this kind of question must not (36

2: This kind of problem needs to be an equation of x.

Solution: Let the width of the rectangle be x and the length is known to be 2 quilts of width, so the length is 2x2x+2(2x)= The solution is that x is equal to the width is, and the length is the area is equal to the length x height =

To do this kind of problem, you need to look at the number of digits after the decimal point, divide 29 by 100 if there are 2 digits, and then see if the numerator can be divided into points, if you can divide it by the common fraction at the same time. Divide until there is no common fraction. There are 3 digits, for example, then divide 39 by 1000

kilometers per hour.

Width: Its area is square meters.

The score is written as (29 100).

1.A 36-kilometre-long road from A to B took an hour for a car to get there and an hour to return the same way. What is the average speed of this car for a round trip?

2.The circumference of a rectangle is meters, where the length is 2 times the width, what is its area?

The fraction is written as ( ).

Super easy?

2.Let the width be x meters, the length be 2x, and the circumference be 6x=

x= area is.

1. v=2*36km (hours.)

v = 72 kmh.

2. Let the width be a, then: 2*(a+2a)=

Learn: a=then area: s=a*2a

s = square meters.

36 km sq.m.

2 (km.)

2 (2*3) = meters of square meters.

1.I .........

2.Divide by 2 to calculate the length of a strip and the width of a strip Divide by 3 equals to calculate a portion which is the width, then subtract the equals to calculate the length, and finally multiply by equals.

3.29/100

Answer: 3 (1-3 n) can be split first, 3 (1-3 n) = 3-3 (n+1).

Then divide by -2.

I can't figure out how this came to be the formula at the bottom.

First, 3 (1-3 n) can be separated, 3 (1-3 n) = 3-3 (n+1).

Then divide by -2.

The first is the denominator, 1-3=-2. This is a direct calculation.

The numerator multiplies 3 in parentheses. And then there's the following result. There is nothing difficult about this.

A two-digit decimal place is rounded to sell the forest imitation spring shed, the largest of these two decimal places is ( ) medium fiber, the smallest is ( ).

This two-digit decimal place is the largest ( and the smallest is (

1) What is the next time Ming Ming and Dongdong meet in the library?

2) Ask yourself to come up with a math problem and answer it.

The least common multiple is: 12

A week is: 7 days.

Then the next meeting is: Wednesday.

2) When did Ming Ming and Dongdong meet again?

Solution: The least common multiple of 2 and 3 is: 6

The time when the two met again was week 4

You first draw an image of a function of this function, which is open upwards, so as long as the two endpoints are brought in less than zero, the inside of the endpoint will be less than zero.

It can be considered by borrowing a number line.

For any number m, m + 1 > m (because 1 > 0).

If 0 > m + 1

0 > m + 1 > m

For any p there is 0 > m + 1 > p > m. in the (m, m+1) interval

I get dizzy when I see the math interval function like a line hahaha.

The power of 7 is greater than 1, and the power of 7 is greater than 0 and less than 1, less than 0, so less than than

The exponential function is the same as the large base of the exponential function (if the exponent is greater than 1, the exponent is between 0 and 1, the opposite is true), then the number 1 is greater than 2 and greater than 3

The power of 7 is greater than 1

The seventh power is greater than 0 and less than 1

Less than 0 so 7 >>

Drawing is clearly negative.

The power of 7 is greater than 1

to the power of 7 is less than 1

In summary, 1 is greater than 2 and greater than 3

1.multiply 7s.

2.Multiply 7.

3.I don't understand.

4.Connect the three with " ".

7 to the power of 0 = 1, and the power of 7 is greater than 1

1 to the 7th power = 1, and to the 7th power is less than 1

ln1=0, less than 0

So 3 "2" 1

1. Divide the total number of questions correctly by the total number of people, which is the average number of questions each person gets right.

6 7 + 12 8 + 24 9 + 6 10) (6 + 12 + 24 + 6) = Dao).

2. Take the arithmetic deviation between 22 players and 170.

i.e. , +2, +1, +3, find the average.

There are 48 people in the first question, and a total of 34 questions are done correctly, so the average number of questions per person is 17 24 questions correct.

In the second question, subtract 170 from all the numbers, calculate the sum of them, divide by 20, and finally add back to 170 to get the average height of all people. Is this okay?

1. (6x7 l2x8 24x9 6x10) divided by (6 12 24 6) = ?(Do the math yourself.) )

2. Is the average value required? Subtract 160 from each of these 12 numbers and add 160 to the average of the new 12 numbers. I'm sorry I answered you with my mobile phone on the Internet, some of the symbols can't be typed, and the answer is relatively brief.

In the first question, no matter how many people are said to have done the right questions, you just need to add up all the questions to get one number, and then add up all the numbers to get another number. The former by the latter is the average number of questions done correctly per person.

The second question, I forgot whether I learned positive and negative numbers in the eighth grade, if so, take 170 as the base point, each number = 170 + x, for example, 170 = 170 + 0;167=170+（-3）；171=170+1。。。i.e. x1; x2。。。The average height of the players is 170+x (average).