28 degrees 12 minutes / 3 = calculation process

28 degrees 12 minutes / 3 = calculation process

(28°21')÷3
=(27°81')÷3
=(27°)÷3+(81')÷3
=9°+27'
=9°27'

53 degrees 40 minutes 30 seconds × 2-75 degrees 57 minutes 28 seconds △ 2=_____ (the process is detailed, it's better to send a picture)

53 degrees 40 minutes 30 seconds × 2-75 degrees 57 minutes 28 seconds △ 2
=106 degrees 80 minutes 60 seconds - 37.5 degrees 28.5 minutes 14 seconds
=107 degrees 21 minutes 0 seconds - 37 degrees (30 + 28.5) minutes 14 seconds
=107 degrees 21 minutes - 37 degrees 58 minutes (30 + 14) seconds
=107 degrees 21 minutes - 37 degrees 58 minutes 44 seconds
=69 degrees, 22 minutes, 16 seconds

Use scientific notation to express 0.000695 and keep two significant numbers as______ ．

000695 = 6.95 × 10-4 ≈ 7.0 × 10-4

What are the polysyllabic characters in classical Chinese in the first lesson of PEP Chinese book (Volume 2, grade 6)?

I'm glad to answer for you
In the middle of the period, it is the first time that the two characters "Jiaoyu" come into contact with polyphony
The last word is not polysyllabic, but interchangeable
We have just finished

Given the image of a function (1,1) and (2, - 1), find the expression of this function

Let the expression of this first-order function be y = KX + B,
Substituting points (1,1) and (2, - 1), we get
{k+b=1
2k+b=-1
The solution is: {k = - 2
b=3
A: the expression of this linear function is y = - 2x + 3

On the blackboard, there are seven numbers 8, 9, 10, 11, 12, 13 and 14. Erase two numbers at any time, and then write the sum of the two numbers minus 1
There are seven numbers on the blackboard: 8, 9, 10, 11, 12, 13, 14. Erase two numbers at any time, and then write down the sum of the two numbers minus 1. For example, if you erase 9 and 13, you need to write 12. After () times, there will be only one number left on the blackboard, which is (71)

The first time I erase six numbers and write down three numbers, then sum is reduced by 3
The second time, four numbers are erased, two numbers are written down, and the sum is reduced by 2
For the third time, erase two numbers, write down the last number, and reduce the sum by 1
So the last number written down is
8+9+10+11+12+13+14-3-2-1
=71

Why is the volume of water entering the container the volume of reduced oxygen in the test of oxygen content in air?
Just learn, thinking more confusion, may be nonsense, we do not mind ⊙ ﹏ ⊙
That is, why does the volume of water equal to the volume of oxygen? The composition of water is different from that of oxygen. Ignoring the volume of two hydrogen atoms? The more you say, the more chaotic you are,

The main reasons are as follows: the combustion of red phosphorus consumes oxygen in the air, making the pressure in the bottle smaller than the atmospheric pressure outside. After opening the clamp, the atmospheric pressure outside is greater than that in the bottle, so the liquid is pressed in, So we can calculate the volume of oxygen according to the volume of liquid. If we change water into milk or other liquid, the result will be the same. But we can't change it into liquid that can react with CO2 in the air, otherwise the measured volume will be too large

As shown in the figure, in square ABCD, e is the point on BC, CF bisector angle DCG, AE is perpendicular to AF, AE = EF
G is the point on the BC extension line``

Where's g

1.8 to 2 / 3

1.8 to 2 / 3
=9/5：2/3
=27：10

A very simple quadratic radical
1-x under the root of absolute value of 2-x

The numerator is 1-x under the root sign. Because 1-x is greater than or equal to 0, the value range of X is less than or equal to 1. The denominator cannot be 0, so the absolute value of 2-x is not equal to 0, and X is not equal to 2. To sum up, X is less than or equal to 1