I need a math lesson in need Help me

When I got this book, I turned it over and looked at it, it was different from what I imagined, the book seemed to have no shadow of mathematics, it was an interesting storybook, and the features: life! After a careful look at the content of this book, I woke up, aha!

Mathematical knowledge is integrated into a small story without leaving a trace, haha! Relaxed, natural, simple.

The story goes like this, the children have their own learning life! Therefore, the school's math day is a public display of the children's math learning report, around the math day of the children both to complete the report and participate in the performance rehearsal, the conflict between learning and hobbies, the children chose the performance rehearsal, in the costume production ingenious production of their own unique plane geometric figure costumes, these colorful costumes inadvertently let the children master the types of plane graphics, as well as the relationship between each other, the combination of play and learning, It also allowed the children to be recognized by the teachers and classmates in the mathematics learning report performance, it turns out that mathematics is so simple to hide in life.

After reading this interesting storybook, combined with the bits and pieces of Meng Meng's learning, recalling the learning when I was a child, I really feel that how can I guide children to learn mathematics? Go to life to find answers, life is the real kingdom of mathematics.

Now,I don't need to read this kind of book word by word to Mengmeng.,Mengmeng can read it herself.,After reading it,Mengmeng suddenly asked me: "Mom,Didn't you say that I was reading a book about mathematics?" Why can't I see math hidden?

It's a storybook! Math books in**? Hee-hee!

I laughed, cute math is hidden in life! You see there's a shadow of mathematics in this book? Looking for it?

Meng Meng began to look at it again, and after a while, she held the book for me to read, here, oh! Over here!

Learning from life will make complex and boring mathematical problems simpler, therefore, the concept of this book and the storyline let us natural, close, familiar, no longer have the feeling of indoctrination, unconsciously grasp the understanding of plane graphics, the next few pages of the book and introduce questions to children, you might as well come to its problems, more rich and deepen the understanding of plane graphics, it can be said that slowly, gradually, we have in-depth learning, it is really an interesting mathematics book!

At the end of the book, there is a full English version, see how our English is? Anyway, I can't recognize a few English words, and interested children will definitely pester to learn them, haha! Meng Meng is not so easy to learn, and I will help Meng Meng introduce interest at the right time, hehe!

First of all, I need to charge it first!

An interesting book that inadvertently engages us in learning, so we love this book!

Meng Meng also has a big idea, and I want to make an interesting graphic T-shirt, haha! Apply what you've learned! It seems that this math help is still an interesting handicraft course!

Look at the end of Meng Meng's interest in studying, you know that our family should paint colorful again, what does Meng Meng's T-shirt look like?

The function image is always above the x-axis, and the range of values of a is obtained.

The image is above the x-axis, so there is no intersection between the image and the x-axis, and the discriminant should be less than 0b -4ac

2a)²-4*3

4a²-12<0

4a²-12=4(a²-3)<0

The value range of -root number 3a is (-root number 3, root number 3).

2,f(x)-f(a-1)=-9

Is f(a)-f(a-1)=-9 ??

3a 2+3-[3a 2+4a+4]=-9, the solution is a=2

The quadratic term coefficient is greater than 0, and the graph opening is upward.

The graph is above the x-axis, i.e. the graph does not have an intersection with the x-axis.

The equation x 2 + 2 ax + 3 = 0 has no real solution.

4a^2-12<0

a^2<3

Range of a:- 32According to the title.

a^2+2a*a+3-[(a-1)^2+2a(a-1)+3]=-93a^2+3-(a^2-2a+1+2a^2-2a+3)=-93a^2+3-(3a^2-4a+4)=-93a^2+3-3a^2+4a-4=-9

4a=-8a=-2

1. The minimum value (4*3-4a 2) 4>=0, the solution is - root number 3< = a< = root number 3.

2. Directly substitute the calculation, and get a=-2

There's something wrong with your diagram.

There are no necessary instructions, just a picture?

If the circle is not tangent to the edge, it doesn't matter.

If there is a tangency, it is the same as the answer.

Intersect with the y-axis at the point a(0,c), the s triangle abc=3, then c=3;oc-ob=2，oc*ob=3，ob=3，oc=5，ob+oc=-b=8，b=-8

Set the coordinate origin to o

s=so ao=3

So c=3 is c(m,0), b(m-2,0)m>2

x1*x2=3

m^2-2m-3=0

m=3, so x1+x2=4=-b

b=-4，c=3

Question 1 (1) Volume is 40 (2) 72 (3) 40 (4) 272 Question The answer is 3 3 3 6 723 Question (1) 44 (2) 4x4x3 = 48

4. The equation for 20 is 20x20x6=2400, and I hope it will be adopted.

1. Suppose that the height of B is x: can be obtained:

260*150*325=130*130*x* i.e.; x=300mmSecond, assuming that the minimum discount is x:

1000*x 600> (i.e.: x= i.e., the minimum discount of 66 can be discounted.)

3. Assuming that the pricing is completed as early as x:

i.e.: x=175

Usually said 19 inches, said the length of the diagonal is 19 inches, which is converted to 19 * centimeters and the length is 16x, and the width is 10x, which is defined by the title.

16x）²+10x）²=（

356x²=x²=

The length should be about, the width is about, you can use the Pythagorean theorem of the triangle to calculate, the diagonal line is 19 inches=, which is also the hypotenuse of the triangle, the two right-angled sides are pressed by 16:10, and a scale factor x is set, then (16x) 2+(10x) 2=, and then calculate x=, then the length = 16 * approx., width = 10 * approx.

Diagonal length=19 cm.

Length: Width = 16:10 = 8:5

If it is 8x cm long, it will be 5x cm wide.

8x）²+5x）²=

x = length = 8x = centimeters.

Width = 5x = cm.

If there is something you don't understand, ask again, I wish you to learn and make progress and go to the next level! (

About 16 inches and 10 inches.

19 inches is diagonally long.

The amount is the length of the diagonal line.

You're terrible at math, aren't you?