On Agriculture

On Agriculture

When the clouds go down the mountain, the ground is not dry
The clouds hang and the rain falls
When the dark clouds take over, it will be cloudy
When the clouds are low, it will rain, but when the clouds are high, it will clear up
As soon as the day broke, the river rose
If a red cloud turns black, it will rain heavily
Beans in the sky, dead people on the ground
When the sun sets and the clouds rise, the rain rings in the middle of the night
Sunset rouge, not rain is the wind
Sunset in the clouds, rain after midnight
There are clouds in the sky and rain on the ground
There are black clouds in the northwest, and thunderstorms are bound to come
Clouds from the northeast, there must be wind and rain
There is a rain mountain with a hat, but no rain mountain without a waist
The sky fish scale spot, basks in the grain does not need to turn
Not afraid of rainy weather for a long time, as long as the northwest open mouth
Cloud to the East, rain into wind, cloud to the south, water ripple, cloud to the west, under the ground
Sometimes it rains and sometimes it's sunny. It doesn't stop for days and nights
Dark clouds block the East, there is no rain, there is wind
There are purple clouds in the morning and thunderstorms in the afternoon

What will be the test topic for Mathematics in volume two of grade six?
What to test, what to test, what to test
It's from Nansha primary school in Zhangjiagang City, Jiangsu Province!

Area and perimeter formula of each figure
Characteristics of each figure
Volume and surface area of solid figure
Positive and negative proportion
Broken line and sector chart
Mathematics wide angle in 12 mathematics books
The use and concept of prime number and factor
Decomposition quality factor
…………
Just read more math books~
I'm going to graduate from primary school
Let's work together!

Simple calculation of 5 / 19 * 14 / 17 + 8 / 17 * 14 / 15

=5/19*14/17+14/17*8/15
=14/17*(5/19+8/15)
=14/17*227/(15*19)
=(14*227)/(17*15*19)
Is there a clerical error in the title?

Factorization: (1) 25a-5a2; (2) (X-Y) 2 + 4xy

（1）25a-5a2=5a（5-a）；（2）（x-y）2+4xy，=x2+2xy+y2，=（x+y）2．

One and six times a few equals one and seven times a few equals one and eight times a few

Let's say it's equal to 1 and write it in terms of two reciprocal numbers
1 / 6 × (6 / 7) = 1 / 7 × (7 / 8) = 1 / 8 × (8 / 9)

The line L passing through point m (12,1) intersects with circle C: (x-1) 2 + y2 = 4 at two points a and B. C is the center of the circle. When ∠ ACB is the minimum, the equation of line L is______ ．

Verify that the known point m (12,1) is in the circle. When ∠ ACB is the smallest, the straight line L is perpendicular to cm. According to the equation of the circle, the center of the circle C (1,0) ∵ KCM = 1 − 012 − 1 = - 2, ∵ KL = 12 ∵ l: Y-1 = 12 (X-12), we get 2x-4y + 3 = 0, so we should fill in 2x-4y + 3 = 0

Solution equation: (2x / 3) = 3 (600-x) △ 3

2x/3=600-x
3(2x/3)=3(600-x)
2x=1800-3x
2x+3x=1800
5x=1800
x=360

The known set a = {x | - 2

∵A={x|-2

Find a rule: half, two seventh, three fourths, four fourths, five fourths, six fourths. What's next? Why

The molecular law is 12345678
The law of denominator is 2 + 5 = 7, 7 + 7 = 14, 14 + 9 = 23, 23 + 11 = 34, 34 + 13 = 47, 47 + 15 = 62
The next one is 7 out of 62

Given the function f (x) = (AX ^ 2-2ax + 3a-2) e ^ x (a ≥ 0), its domain of definition is [0, + ∞) (1) finding the monotone interval of F (x)
(1) Find the monotone interval (2) of F (x). If the minimum value of F (x) in [0, + ∞) is 4, find the value of A

(1) The derivative of F (x) is f '(x) = (AX ^ 2-2ax + 3a-2) e ^ x + (2ax-2a) e ^ x = (AX ^ 2 + A-2) e ^ x 1. When a = 0, it is obvious that f' (x) is always less than 0, so in the domain of definition, f (x) monotonically decreases by 2. When A2, at this time, f (x) is an increasing function, so there is a minimum value at 0, f (0) = 3a-2 > > A = 4 / 3, which does not meet the conditions, and then 0A = 2, so the calculation part of a = 2 has not been written in detail. You can calculate it yourself