The next chapter, how to improve the grade of mathematics in one month

The next chapter, how to improve the grade of mathematics in one month

Read more books, with questions to learn knowledge. Ask teachers and classmates. If not, please tutor. I took a junior high school student's math tutor before, junior high school knowledge is still very easy to make up. A month's math score is not difficult. Encourage children, no problem

Given that | x | = 5, | y | = 7, and | X-Y | = X-Y, then the value of XY is

x=±5
y=±7
|If X-Y | = X-Y, then X-Y ≥ 0
x≥y
So x = ± 5, y = - 7

Reflection principle of light

Reflection of light: the phenomenon that light changes its propagation direction on the interface of two substances and then returns to the original substance is called reflection of light. Understand the law of reflection of light. 1 in reflection phenomenon, reflected light, incident light and normal are in the same plane. 2 reflected light, incident light occupies two sides of normal. 3 reflection angle equals incident angle

What's the law of 1, - 4.9, - 16,25, - 36,...? what's the law of - 2,8, - 18,32, - 50,72,...? let's use the algebraic formula containing n to table

The first problem is the square sequence of natural numbers; 1 * 1,2 * 2,3 * 3... N * n
2 * 1 * 1,2 * 2 * 2,2 * 3 * 3.2 * n * n

If the M-1 power of 2a is a quaternion of a and B, then M=

If the M-1 power of 2a is a quartic monomial of a and B, then M = 4
2ab^(m-1)
n-1=3
m=4
(the title is missing b)

Review questions of unit 2 of the answers to mathematics homework in Volume 1 of Grade 8

A. D, 22,13, B, isosceles, 72 °, 72 °, 4 °, root 7,9. ∵ DB = DC, angle c = 29 °∵ DBC = ∠ C = 29 °∵ ADB = ∵ C + ∵ DBC = 58 ° and ∵ AB = ad ∵ abd = ∵ d = 18 °∵ a = 180 ° - ∵ abd - ∵ ADB = 64 ° 10. ∵ ad = AE ∵ 1 = ∵ 2 ∵ 1 + ∵ 3 = 180 ∵ 2 + ∵ 4 = 180 ∵ 3

Arrange the positive and even numbers into 5 columns according to the following table
Arrange the positive and even numbers into 5 lines according to the following table
Column 1 column 2 column 3 column 4 column 5
Line 1 2 4 6 8
Line 2 16 14 12 10
Line 3 18 20 22 24
Line 4 28 26
Then 2010 should be in line () and column ()
Note that the question is where 2010 is, not the number of rows in 2010.

Look at each line. The first line is an even number from 1 to 8, the second line is an even number from 9 to 16, the third line is an even number from 17 to 24, and so on So divide 2010 by 8 to get the number of rows
2010 / 8 = 251, so it's the first even number in line 252 (because it's an even number, that is, one for every two numbers, so the remaining two is the first even number in the line)
Because the even number behavior is from right to left and the fifth column is empty, it should be
Column 1 column 2 column 3 column 4 column 5
Line 252 2018 2014 2012 2010 empty
That's line 252, column 4

Write all the multiples of 15 within 100, where the odd number has______ Even numbers have______ ．

The multiple of 15 within 100 is: 15, 30, 45, 60, 75, 90. The odd number is 15, 45, 75. The even number is 60, 90

Find some typical proportion problems in Grade 6

Hello! 1. There is a batch of coal in the canteen. It is planned to burn 105 kg of coal every day for 30 days. After improving the coal burning technology, 90 kg of coal can be burned every day. How many more days can this batch of coal be burned? 2. Yuejin machine tool factory originally planned to manufacture 200 machine tools in 30 days, but only 40 machines were left behind in 20 days

There are red, yellow, blue and green balls in four different colors. Put them in three boxes. No matter how many balls are in at least one box

On the principle of drawer
No matter how you put it, there are at least two balls in one box