Among the five consecutive even numbers, the sum of the last two numbers is exactly equal to the sum of the first three numbers. These five consecutive even numbers are

Among the five consecutive even numbers, the sum of the last two numbers is exactly equal to the sum of the first three numbers. These five consecutive even numbers are

Let the first be x, then the last four be x + 2, x + 4, x + 6, x + 8
x+x+2+x+4=x+6+x+8
3x+6=2x+14
x=8
These five numbers are 8, 10, 12, 14 and 16

Five consecutive even numbers, the sum of the first three numbers is 2 / 15 less than the sum of the last three numbers. What is the sum of these five numbers?
What's the formula

The first three are 12 less than the last three
So the sum of the last three numbers is 12 / (2 / 15) = 90
The last three numbers are 28, 30 and 32
The first three numbers are 24, 26 and 28
The sum of five numbers is 28 * 5 = 140

There are five consecutive even numbers. It is known that the third number is 18 more than 14 of the sum of the first number and the fifth number. The sum of these five even numbers is______ ．

Let the first even number be x, then the following four numbers are in order: x + 2, x + 4, x + 6, x + 8. From the meaning of the title, we can get x + 4 - (x + X + 8) × 14 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X + 4-12x-2 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

There are five consecutive even numbers. It is known that the third number is 18 more than 14 of the sum of the first number and the fifth number. The sum of these five even numbers is______ ．

Let the first even number be x, then the following four numbers are arranged in order: x + 2, x + 4, x + 6, x + 8. From the meaning of the title, we can get x + 4 - (x + X + 8) × 14 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X + 4-12x-2 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 12x = 16 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; The five numbers of x = 32 are: 32, 34, 36, 38, 40; and 32 + 34 + 36 + 38 + 40 = 180

There are five consecutive even numbers. It is known that the third number is 18 more than 4 / 1 of the sum of the first number and the fifth number, and the five even numbers are []
Brother and sister help

Let the third number be X
X=（X-4+X+4）*（1/4）+18
X=36
So the number of five is 32 34 36 38 40

There are five consecutive even numbers. It is known that the third number is 18 more than 14 of the sum of the first number and the fifth number. The sum of these five even numbers is______ ．

Let the first even number be x, then the following four numbers are arranged in order: x + 2, x + 4, x + 6, x + 8. From the meaning of the title, we can get x + 4 - (x + X + 8) × 14 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X + 4-12x-2 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 12x = 16 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; The five numbers of x = 32 are: 32, 34, 36, 38, 40; and 32 + 34 + 36 + 38 + 40 = 180

There are five consecutive even numbers. It is known that the third number is 18 more than 14 of the sum of the first number and the fifth number. The sum of these five even numbers is______ ．

Let the first even number be x, then the following four numbers are in order: x + 2, x + 4, x + 6, x + 8. From the meaning of the title, we can get x + 4 - (x + X + 8) × 14 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X + 4-12x-2 = 18 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

A new operation is defined: for any real number a and B, a times b = 1 / a minus 1 / B, for example, 3 times 2 = 1 / 3 minus 1 / 2 = 1 / 6,
Then (- 3) times 4 is () a minus seven twelfth, B minus one twelfth, C minus one twelfth, D minus one seventh

A

What is the meaning of one-third a minus one-half B?

How much more is a third than B half

8 g of carbon dioxide and 3. 6 g of water are produced after 2. 8 g of a compound is completely burned in oxygen

If it is completely burned in oxygen, all the carbon and hydrogen elements in the product come from the original compound,
8 g CO2 contains C, mass = 8.8 * (12 / 44) = 2.4 G
3.6 g water contains H element, mass = 3.6 * (2 * 1 / 18) = 0.4 g
4 + 0. 4 = 2. 8 g, just equal to the mass of the original compound,
It shows that the original compound contains only C element and H element