When the value of X is - 3, the value of the algebraic formula - 3x2 + ax-7 is - 25, then when x = - 1, the value of the algebraic formula is -______ ．

When the value of X is - 3, the value of the algebraic formula - 3x2 + ax-7 is - 25, then when x = - 1, the value of the algebraic formula is -______ ．

When x = - 3, substituting - 3x2 + ax-7 = - 25, a = - 3, substituting a = - 3 and x = - 1 into - 3x2 + (- 3x) - 7, - 3 × (- 1) 2 + (- 3) × (- 1) - 7 = - 7

When x = - 3, the value of the second power + ax-7 of the algebraic formula - 3x is - 25, then when x = - 1, the second power of the algebraic formula - 3x
If the 1-third a power of - 8x and the cubic Z of Y is a binomial of degree six, then the value of a is ()
A.3
B.-3
C.-15
D.15
If the coefficient of the unknowns of equation - 5 / 4 T = - 10 is changed to 1, then the equation is transformed into_____ .
If the value of the algebraic expression 3x-5 and seven tenths are reciprocal to each other, then x=_____
In order to attract customers, Xiaomin's father bought a 9000 yuan computer and paid 30% for the first time and 450 yuan for the next month____ I'll pay for the purchase in three months

First, when the value of X is - 3, the value of the algebraic formula - 3x & # 178; + ax-7 is - 25, a = - 3 is obtained, and then x = - 1 is substituted into - 3x & # 178; - 3x-7 to get - 7

The solution equation: x2-2x-2 = 0

The formula is x2-2x + 1 = 2 + 1, that is, (x-1) 2 = 3, the formula is X-1 = ± 3, the solution is x 1 = 1 + 3, x 2 = 1-3

Using formula method to solve the equation: X Λ 2 + 2x-5 = 0

a＝1,b＝2,c＝-5,△＝b²-4ac＝24
x＝（-2±2√6）/2
x1＝-1+√6,x2＝-1-√6

Find the law 1,0,1,2,3,5, () ()
1,0,1,2,3,5, () () and 0,1,1,2,3,5, () () should be different
13，21。 I'll do the same, but item 2 and 4 are different

1,0,1,2,3,5,3,5,7
My idea is: 1-1 = 0; 0 + 1 = 1; 1 + 1 = 2; 2 + 1 = 3; 1-1 = 1; 1-1 = 2; 2-1 = 3; 1-1 = 1; 1-1 = 1; 1-1 = 1; 1-1 = 2; 2-1 = 3; 1-1 = 1;
3+2=5；5-2=3；3+2=5；5+2=7.
I don't know if it's right

What is the definition of positive and negative numbers?

A number greater than 0 is called a positive number, and a number preceded by a negative sign - is called a negative number

There are several kinds of numbers in mathematics
For example, real number, imaginary number, positive number, negative number, etc. to be divided into smaller parts, for example, integers should be divided into positive integers, negative integers, etc. The more complete the better

The complex number (c) is the largest, and then the complex number includes imaginary number (I) and real number (R). The real number is divided into rational number (q) and irrational number (Q *). At the same time, the rational number is divided into integer (z) and fraction. Then the integer is divided into natural number (n). In another range, the real number is divided into positive number and negative number

Common factor of 39 and 88

1

Man cannot change the length of life, but he can increase its depth
It's a whole poem, but I forgot the following,

The length and width of life
You can't change the environment, but you can change yourself;
You can't change the facts, but you can change your attitude;
You can't change the past, but you can change the present;
You can't control others, but you can control yourself;
You can't predict tomorrow, but you can grasp today;
You can't control the weather, but you can change your mood;
You can't choose your face, but you can smile;
You can't do everything well, but you can do everything with your heart;
You can't extend the length of life, but you can determine the width of life
Don't give up, or you will be sorry for yourself
To conquer the present is to achieve the future

New target English for eighth grade 12 pages 3A
I'm in a hurry. Thank you

In ten years,I think I’ll be a reporter.I’ll live in Shanghai,because I went to Shanghai last year and fell in love with it.I think it’s really a beautiful city.As a reporter,I think I will meet lo...