2 (3x-1) = 10 solution equation It's due tomorrow

2 (3x-1) = 10 solution equation It's due tomorrow

2(3x-1)=10
6x-2=10
6x=10-2
6x=12
x=2

The solution equation: (1) 3x (x + 1) = 3x + 3 (2) 3x2-6x + 1 = 0 (matching method)

(1) 3x (x + 1) = 3x + 3, equation deformation: 3x (x + 1) = 3 (x + 1), term transfer: 3x (x + 1) - 3 (x + 1) = 0, factorization: 3 (x + 1) (x-1) = 0, can get x + 1 = 0 or X-1 = 0, solution: X1 = - 1, X2 = 1; (2) 3x2-6x + 1 = 0, term transfer: 3x2-6x = - 1, deformation: x2-2x = - 13, formula: x2-2x + 1 = 23, namely (x-1) 2 = 23, square root: X-1 = ± 63,  X1 = 1 + 63, x2 =1-63．

The root of equation 3x (x-1) = 2 (x-1) is?

3x（x－1）＝2（x－1）
3x²-3x=2x-2
3x²-3x-2x+2=0
3x²-5x+2=0
(3x-2)(x-1)=0
The solution is x = 2 / 3 or x = 1

Known: x2 + 3x + 1 = 0, find the value of x2 + 1x2

∵ x ≠ 0, the known equation is transformed into x + 3 + 1 x = 0, that is, x + 1 x = - 3, then x2 + 1 x 2 = (x + 1 x) 2-2 = 9-2 = 7

Find the law 81,64,49 〔〕 need detailed calculation method

36,25
It's the square of 9, 8, 7, 6, 5~

Let n be a positive integer greater than 2, and prove that there exists a prime number P satisfying n

Suppose that all prime numbers less than N + 1 are P1, P2,..., PS
When n = 3, the proposition is obviously true
n> 3 P1 * P2 *... * PS

What is the minimum value of the function y = cos square x-sin square x,

Cos square x + sin square x = 1
So y = cos squared x-sin squared x = 1-2 sin squared X
When SiNx takes the maximum value of 1, the function has the minimum value of - 1

The distance between AB and a is 32 kilometers. A and B vehicles are running from AB and B at the same time. They meet each other in 2 hours. The speed ratio of a and B vehicles is 7.5:8.5. How many kilometers per hour are the speeds of a and B vehicles?

7.5/8.5=15/17
Let a be 15x, then B be 17x
2*(15x+17x)=32
x=1/2
15x=7.5
17x=8.5
A: the speed of a and B is 7.5 km and 8.5 km respectively

Arrange the rules of natural numbers. Each natural number corresponds to a coordinate. For example, the coordinate corresponding to number 3 is (1,1). What is the coordinate corresponding to number 2005
Answer with the knowledge of grade seven

(10021002) hehe, isn't it

The reciprocal of natural numbers is smaller than 1______ (judge right or wrong)

According to the analysis, there is no reciprocal of 0, the reciprocal of 1 is still 1, and the reciprocal of natural numbers greater than 1 is less than 1. Therefore, the reciprocal of natural numbers is smaller than 1