On women's day, mom, I want to say 500 words to you 9: 30 years ago

On women's day, mom, I want to say 500 words to you 9: 30 years ago

No one can take the place of my mother in this world. My mother brought me to this world with the pain of having a baby in October. She brought me up with hard sweat. At the moment when I was born, my mother was no longer young

What did I do for my mother on women's day

Writing 500 words for mother on women's Day

Today, as soon as my mother came home from work, she was so tired that she sat on the sofa and kept saying, "I'm so tired, I'm so tired..." When I saw this scene, I thought: the teacher asked us to help my mother do something? This is a good opportunity. I'll help my mother beat her back! Thinking of this, I went to my mother and said to her

If the vertex of the parabola y = AX2 + k is on the straight line y = - 2, and if x = 1, y = - 3, find the value of a and K

According to the meaning of the question: vertex coordinates are (0, - 2), substituting (0, - 2) and (1, - 3) to get: k = - 2, a + k = - 3, the solution is: a = - 1, k = - 2

Simplify | X-1 | + | x | how to write when x ＞ 1 by using zero point segmentation method, and | 2x-1 | + | x + 1 |, find | X-2 | + | x-4 | + | X-6 | + |X-2000 | min
And simplify the format

|X-1 | + | x | when x ＞ 1, | X-1 | + | x | = 2x-1 | 2x-1 | + | x + 1 | when x ＞ 1, | 2x-1 | + | x + 1 | = 3x | X-2 | + | x-4 | + | X-6 | + |X-2000 | first of all know that the absolute value is distance, then | X-2 | + | x-4 | + | X-6 | + |X-2000 | denotes the minimum of the distance between X and 2,4,6,8,..., obviously between 2 and

What is the basis of reduction___ The purpose of reduction is to change a fraction into___ .

If the numerator and denominator are divided by a number that is not equal to 0, the value of the fraction remains unchanged
simplest fraction

Solve a quadratic equation of one variable
Square of 2x + 3x-1 = 5

2x^2+3x-6=0
Discriminant = 9 + 8 * 6
=9+48
=57
X = (- 3-radical 57) / 4
X = (- 3 + radical 57) / 4

Do not change the value of the fraction and the sign of the fraction itself, so that the denominator of the two fractions is the same
1、（a-b）/（a²-2a+1）,（2a+3）/（2a-a²-1）
2、（a-2）/（a-3）,（a+1）/ -（a-2）（3-a）

1.（2a+3）/（2a-a²-1）=-（2a+3）/（-2a+a²+1）=-（2a+3）/(a²-2a+1)
2.（a-2）/（a-3）=(a-2)/-(3-a)=(a-2)²/-(a-2)(3-a)

Solve the following fraction: (1) 2x + 3 / 5 minus 2x of 2-5 plus 1 = 0 (2) x + 1 of X-1 minus 4 of x ^ 2-1 = 1

(1)
Multiply both sides of fraction by 10x + 25
15-2x(2x+5)=1
15-4x-10x=1
-14x=-14
x=1
(2)
Multiplication on both sides of fraction (x-1) (x + 1)
（x+1）^2-4=x^2 -1
x^2+2x+1-4=x^2-1
2x=2
x=1

If a system of homogeneous equations has a nonzero solution, what is the determinant of its coefficients

If and only if | a | = 0 for n equations with n unknowns