Reading is very interesting?

Reading is very interesting?

Reading is fun. (something is fun.)

I can learn a lot of knowledge?
Don't be too hard

i can learn much knowledge
It's better to use the present tense

A number plus 50% of it equals 7.5. What's the number?
When Master Zhang processes a batch of parts, the ratio of the number of parts completed on the first day to the total number of parts is 1:3. If he processes 15 more parts, half of the batch of parts can be completed. How many parts are there in total?
Cut a square cloth with a side length of 2 meters into the largest round tablecloth. How many square meters is the area of this round tablecloth?
The perimeter of a circular flower bed is 18.84m, and there is a circular path 1m wide around the flower bed. How many square meters is the area of this path?
The outer diameter of a kind of bicycle tire is 70cm. It takes Xiaoming 10 minutes to ride a bicycle from home to school. If the wheel turns 200 circles per minute, how many meters does Xiaoming travel from home to school?
There are a lot of questions, not equations,

1. 5 (1 + 50%) = 52, 1:3 = 1 / 3, 1 / 2-1 / 3 = 1 / 6, 15 ／ 1 / 6 = 90 (pieces) 3. Analysis: the side length of a square is the diameter of a circle. 2 ／ 2 = 1 (meters), 3.14 × 1 × 1 = 3.14 (square meters) 4, 18.84 ／ 3.14 ／ 2 = 3 (meters), 3 + 1 = 4 (meters), 3.14 × (4 & # 178; - 3 & # 178;) = 21.9

Expand the side of a cylinder to get a square. The side length of the square is 3.14 decimeters. The surface area of the cylinder is ()

3.14x3.14+3.14x（3.14÷3.14÷2）²x2
=9.8596+1.57
=11.4296 (square decimeter)

How many minutes does it take for the light from the sun to reach the earth

The distance between the sun and the earth is 147 million kilometers at the near point and 152 million kilometers at the far point, with an average of 150 million kilometers. In astronomy, it is called an astronomical unit (that is, the average distance between the sun and the earth)
The accurate speed of light propagation is 299792458 meters per second, which is generally taken as an integer of 300000 kilometers per second
The time of sunlight reaching the ground = 1500000000 / 300000 = 500 seconds ≈ 8.33 minutes (8 minutes and 20 seconds)

About heat!
Natural gas is a kind of clean energy. The heat released by burning 1m3 of natural gas is equivalent to the heat released by burning kilogram of coke? (the calorific value of natural gas is 8.7 * 10 7 power joules per square meter, and the calorific value of coke is 3 * 10 7 power joules per square meter)
The calorific value of natural gas is 8.7 * 10 to the 7th joule per cubic meter, and that of coke is 3 * 10 to the 7th joule per kilogram

From q = MQ and q = VQ, we have the following results:
Q gas = q carbon
V gas Q gas = m carbon Q carbon
1m3 x 8.7 * 10 ^ 7J / m3 = m carbon x 3 * 10 ^ 7J / kg
M carbon = 2.9kg
Please click adopt, if you don't know, ask

If the sum of the areas of the two squares is 106 square centimeters and their perimeter difference is 15 cm, then the side lengths of the two squares are

One is 5.16 and the other is 8.91
If the perimeter difference is 16, the two sides are 5 and 9
ha-ha
I wish you success in your studies

How to do 125 * 88 with multiplicative distribution law?

125*88
=125*(80+8)
=125*80+125*8
=10000+1000
=11000

Given the function f (x) = x ^ 2-4ax + 2A + 6 (x ∈ R), if the function values are non negative, find the range of function g (a) = 2-A | a + 3 |

x∈R
f(x)=X^2-4ax+2a+6≥0
Discriminant (- 4A) ^ 2-4 * (2a + 6) ≤ 0
(a+1)(2a-3)≤0
-1≤a≤3/2
a+3＞0
g(a)=2-a|a+3|=2-a^2-3a=-(a+3/2)^2+17/4
The opening is downward and the axis of symmetry x = - 3 / 2
(- 1,3 / 2) on the right side of the axis of symmetry
Maximum g (- 1) = - (- 1 + 3 / 2) ^ 2 + 17 / 4 = 4
Minimum g (3 / 2) = - (3 / 2 + 3 / 2) ^ 2 + 17 / 4 = - 19 / 4
Range [- 19 / 4,4]

If a 1m wide straight path is built on a lawn with length of AM and width of BM, the area of the remaining lawn can be expressed as______ M2; now in order to increase the aesthetic feeling, the path is changed into a curved path with a width of 1m (as shown in the figure), and the remaining lawn area is______ m2．

The area of the remaining lawn is a (B-1) if its length is a and its width is (B-1); the area of the remaining lawn is a (B-1) if its length is a and its width is B-1