As long as you are willing to use your mind, bad things can often turn into good things

As long as you are willing to use your mind, bad things can often turn into good things

Newton was hit by an apple and used his brain to discover gravity

What idiom can be used to express a blessing in disguise? Good things and bad things must change with each other. Why?

A blessing in disguise

The story of "a blessing in disguise" shows that bad things can become good things. Thinking: can bad things become good things? Can good things become bad things?
Please give me an example

No, it's up to us, and we can't wait for it to turn into a good thing. It's just an optimistic attitude. But we still have to do our best in life, so that we won't leave any regrets. Thank you~

What is the working volume of the cylinder? The total volume of the cylinder, the compression ratio of the cylinder?

The volume between top dead center and bottom dead center is called cylinder working volume. The sum of combustion chamber volume and cylinder working volume is total cylinder volume. The ratio of total cylinder volume and combustion chamber volume is called cylinder compression ratio

How to calculate 99 × 9 + 9 = simply

99×9+9
=9x(99+1)
=9x100
=900

dy/dx = 1/x-y

For the differential equation dy / DX = f (AX + by + C), the shilling u = ax + by + C
For this problem, let u = X-Y, then dy / DX = 1-du / DX, 1 / X-Y = 1 / u

The water cement ratio of plain water slurry grouting is 1:0.8, and the water glass content is 5%. How much cement is used per cubic meter and how much water glass is used
I want to know the algorithm,

Suppose the bulk density of cement is 1400KG / m3. According to the water cement ratio of 1:0.8, the total volume of 1000kg cement and 800kg water is 0.714 plus 0.8, which is equal to 1.514m3, 33 kg

The result of simplifying the logical expression (a + b) (a + b) is ()
Why a * a = a

According to a * a = a,
Let y = a + B, then
（A + B）*（A + B）= Y * Y = Y = A + B
The truth table is as follows
A A*A
0 0
1 1
So a * a = a

If f (x) is a decreasing function on (- 2,4), and f (a + 1)

-2

How many kilometers an hour can a car travel at a speed of 90 miles on the highway?

90 miles is 90 miles per hour, so you can drive 90 miles an hour at most, so it's 90 miles
144 840.96 meters