Our company needs to test a sample and place it in two temperature environments: 80 ℃ and - 30 ℃, with an interval of 15 seconds. Who has such equipment Place in each temperature environment for 6 hours

Our company needs to test a sample and place it in two temperature environments: 80 ℃ and - 30 ℃, with an interval of 15 seconds. Who has such equipment Place in each temperature environment for 6 hours

There is a kind of multi-layer constant temperature and humidity box on the Internet, which should meet your requirements. Two test boxes can set high temperature and low temperature environment at the same time

It is known that the volume of a cube is 56 times smaller than that of a large cube whose edge length is twice as long as that of another cube, and the edge length of a small cube is more than that of a small cube

Add the word "if the last part of the cube is less than 2 times" and then add it
The answer to the question should be: 56 / (8-1) = 8
The cube root of 8 is 2

Which number in each row is different from the others? Circle it

It should be 20
This is a rule, the difference between each number and each number is 8, but 20 is not
If you have solved your problem, please press the select as satisfactory answer button below

Two and one in two compared with nine 18? 6 compared with four 24? 6 7 compared with one and one in three?

2 and 1 / 2 vs 18 / 9?
2 and 1 / 2 ＞ 18 / 9
∵ 2 and 1 / 2 = 2.5
18 out of 9 = 2
∴2.5＞2
6 vs 24 / 4?
6 = 24 / 4
7 out of 6 vs 1 and 1 out of 3?
7 out of 6 < 1 and 1 out of 3
∵ 1 and 1 / 3 = 4 / 3 = 8 / 6 ＞ 7 / 6
7 out of 6 < 1 and 1 out of 3

3 out of 4 × 9 out of 8 =? 2 out of 1 × 7 out of 9 =? 8 out of 3 × 7 out of 6 =? 24 out of 5 × 5 out of 6 =? 9 out of 2 × 6 out of 7 =
8 out of 25 × 5 out of 4 =?

3 of 4 × 9 of 8 =? 3 / 4 × 8 / 9 = (3 × 8) / (4 × 9) = 2 / 32 of 1 × 7 of 9 =? 1 / 2 × 9 / 7 = (1 × 9) / (2 × 7) = 9 / 148 of 3 × 7 of 6 =? 3 / 8 × 6 / 7 = (3 × 6) / (8 × 7) = 9 / 2824 of 5 × 5 of 6 =? 5 / 24 × 6 / 5 = (5 × 6) / (24 × 5) = 1 / 49 of 2 × 6 of 7 =? 2 / 9 × 7 / 6 = (2

Fill in the blanks with 9 numbers: 11 / 24, 1 / 6, 3 / 8, 1 / 3, 5 / 12, 1 / 4, 1 / 2, 5 / 24 and 7 / 24, so that the sum of the three in horizontal, vertical and oblique lines is equal
(Note: there are three in horizontal and three in vertical, altogether nine.)

The denominator of 3 / 8 1 / 6 11 / 24 is 9 4 11
5/12 1/3 1/4 10 8 6
5/24 1/2 7/24 5 12 7
We can find that their molecules are 11, 4, 9, 8, 10, 6, 12, 5 and 7, which are arranged in the order from small to large: 4, 5, 6, 7, 8, 9, 10, 11 and 12
The average number of the nine numbers (molecules) is 8 (that is, the average value of the nine fractions is 8 / 24 = 1 / 3). Since the sum of three and three is the same, 8 (1 / 3) must occupy the middle. Apart from 8, the remaining eight numbers, which are 12-4; 11-5; 10-6; 9-7, are paired

24 * 7 of 18 = () 5 * 6 of 9 = ()

24 * 7 of 18 = (28 / 3 is 28 / 3) 5 * 6 of 9 = (10 / 3 is 10 / 3)

(1-1 and 2 / 1-8 / 3 + 12 / 7) * (- 24) [50 - (7 / 9-12 / 11 + 6 / 1) * (- 6)] / (- 7)'s Square
Calculate and write the formula

(1-1 and 2 / 1-8 / 3 + 12 / 7) * (- 24) = (1-3 / 2-3 / 8 + 7 / 12) * (- 24) = 1 * (- 24) - 3 / 2 * (- 24) - 3 / 8 * (- 24) + 7 / 12 * (- 24) = - 24 + 36 + 9-14 = 7 [the square of 50 - (7 / 9-12 / 11 + 1 / 6) * (- 6)] / (- 7) = [50 - (7 / 9-11 / 12 + 1 / 6) * (- 6) ^ 2] / (...)

{2 / 3 + 5 / 8-7 / 12} 1 / 24

={2 / 3 + 5 / 8-7 / 12} × 24
=2 / 3 × 24 + 5 / 8 × 24 - 7 / 12 × 24
=16+15-14
=17

Calculation: 7-11 of 24-8 and 2-9 of 7 and 5 of 7

7-11 of 24-8 and 2-9 of 7 and 5 of 7
=24-79/7-68/7-7/8
=168/7-79/7-68/7-7/8
=(168-79-68)/7-7/8
=21/7-7/8
=Two and one in eight