An interesting Chinese lesson of 600 words Must be 600 words of composition, to 5

An interesting Chinese lesson of 600 words Must be 600 words of composition, to 5

Fan Wenyi children, do you know? In fact, learning is not as boring as we think. As long as we observe and experience it carefully, we will find that the fun of learning is endless. For example, this morning, the students had a Chinese class with laughter. Teachers and students said hello to each other before class

An interesting Chinese lesson (Magic clone) composition

Liu Leling, an interesting Chinese class, grade 3 (b). You may think that Chinese class is the most boring. Then you are wrong. Please take a look at a wonderful Chinese class we had "The first is Chinese class, I pray silently in my heart: never recite the text, my memory is not good, in case I can't recite it, in the

If the length of an arc is known to be 1.5 and the center angle of the opposite circle is 45 degrees, the radius of the arc length can be calculated?
What is the sector area of this circle?
How about this fan-shaped weekly song?
The most important: the result reservation!

Circumference = 2 * pie * r
Arc length = 2 * pie * r * angle / 360 = 1.5 pie
R=6
Sector area = pie * r * r * angle / 360 = 4.5 pie
Sector perimeter = arc length + 2 * r = 1.5 + 12

How to find the sum of equal ratio sequence?
Sequence 1, a, a ^ 2, a ^ 3 ,a^(n-1),… The sum of the first n items of is?

The sum of the first n terms of the equal ratio sequence is Sn = A1 (1-Q ^ n) / 1-q. substitute s (n-1) = 1 * (1-A (n-1)) / 1-A = 1-A (n-1) / 1-A

Solve the equation LG (x + 3) + LG (x-1) = LG (x ^ 2-2x-3)

Because lgx is a monotone function
∴lg(x+3)+lg(x-1)
=lg【（x+3）（x-1）】
=lg(x^2+2x-3)
=lg(x^2-2x-3)
There is x ^ 2 + 2x-3 = x ^ 2-2x-3
The solution is x = 0
But also to ensure that x + 3 > 0, X-1 > 0
x^2-2x-3>0
So x = 0 does not fit the meaning of the question
The equation has no solution

Summarizing the examples of Deng Jiaxian in Deng Jiaxian

This paper first describes the desolation of Deng Jiaxian's work place, and speculates on Deng Jiaxian's mood when he led his subordinates to struggle and sacrifice in such an environment. Then it points out that Deng Jiaxian's work needs physical intuition, mathematical insight, courage and steady judgment, It concerns about whether Deng Jiaxian's hand trembles when he shoulders the heavy responsibility and signs the key plan. Then it describes Deng Jiaxian's spirit of taking the lead and fearing no sacrifice in the face of endless problems under extremely difficult conditions. Finally, it quotes a song of the May 4th era as a portrayal of Deng Jiaxian's life, echoing the first part, and puts Deng Jiaxian's contribution in the historical background of more than 100 years

Let the integer part of 4 - √ 2 be x and the decimal part be y. try to find the value of Y & # / X

∵1

X + 2 and 2 / 5 + 5 and 1 / 2 = 31 / 3 how to solve the equation?

X + 2 and 2 / 5 + 5 and 1 / 2 = 31 / 3
X + 7.9 = 10 and 1 / 3
X = 10 1 / 3-7.9
X = 2 and 13 / 30

The perimeter of the low area of a cube is 24 cm

Because the low area perimeter of the cube is 24 cm
So the side length is 6 cm
So the volume is 6 * 6 * 6 = 216 cubic centimeters

If cosa = 1 / 3, cos (a + b) = - 1 / 3, and a, B belong to (0, Pai / 2), then the value of COS (a-b) is equal to

CoSb / 3-root 8sinb / 3 = - 1 / 3cosb-root 8sinb = - 1 (CoSb + 1) ^ 2 = 8sin ^ 2bcos ^ 2B + 2cosb + 1 = 8-8cos ^ 2b9cos ^ 2B + 2cosb-7 = 0 (9cosb-7) (CoSb + 1) = 0cosb = 7 / 9cos (a + b) + cos (a-b) = 2cosacosb-1 / 3 + cos (a-b) = 14 / 27cos (a-b) = 23 / 27