125:75 reduction ratio

Five to three

300 to 125

12./5

How to simplify 0.125:0.25

0.125：0.25 =（0.125×1000）：（0.25 ×1000）
=125：250
=1：2

0.125:1?

Multiply the front and back by 8
0.125:1=1:8

1. How much is the 2007 power of minus two plus the 2008 power of minus two?
2. How much is the power of minus two times the power of minus two times the power of 2008?
3. Between - 100 and 200 (excluding - 100 and 200) on the number axis, there are () points representing integers and () points representing odd numbers
The process of writing the formula... The third one doesn't need to

1. The power of two
2. Negative half
3.299 150

【1】 For a book, I read 2 / 5 in the first week and 1 / 5 in the second week, but there are still 6 pages left. How many pages are there in this book?
【2】
The average score of language, mathematics and foreign language in the final examination of Cong Cong is 90, and the ratio of language, mathematics and foreign language is 8:9; 10. What are the scores of the three subjects
【3】
For a section of road, 45% of the total length was built on the first day and 40% on the second day. A total of 8500 meters were built in two days. How long is this section of road

1)6÷（1-2/5-1/5)=6÷2/5=15
2)90*3=270
270*8/27=80
270*9/270=90
270*10/27=100
The scores of the three subjects are 80, 90 and 100 respectively
3)8500÷(45%+40%)=8500÷85%=10000

Function y = (x2-4x + 3) 2-2x2 + 8x + 3 + A, 0 ≤ x ≤ 3. Find (1) t = x2-4x + 3, find the value range of T. (2) when the maximum value of Y is equal to 6, find a
Several 2's are squares (except the 2 of 2x itself),

1.
t=x2-4x+3
The axis of symmetry is x = 2
And because 0 ≤ x ≤ 3, this is a quadratic function with an opening upward
So there is a minimum value when x = 2 and a maximum value when x = 0
x=2,T=-1
X=0,T=3
So t ∈ [- 1,3]
two
y=(x2-4x+3)^2-2x2+8x+3+a
=(x2-4x+3)^2-2(x2-4x+3)+9+a
Let t = x2-4x + 3 be taken into the above equation
y=t^2-2t+9+a T∈[-1,3]
The axis of symmetry is t = 1, which is a quadratic function with an opening upward
So when t = 3 or - 1, there is a maximum of 6
6=3^2-2*3+9+a
a=-6

x4-2x3-x2+2x+1=0
How to solve it

x²(x²-2x+1)-2x²+2x+1=0
x²(x-1)²-2x(x-1)+1=0
(x(x-1)-1)²=0
x(x-1)-1=0
x1=(1+√5)/2
x2=(1-√5)/2

Given X3 + x = 2, find the value of the polynomial x4-2x3 + x2 + 2014

Answer: x ^ 3 + x = 2x ^ 3 = 2-x obviously, x = 1 is the only solution of the equation, x ^ 4-2x ^ 3 + x ^ 2 + 2014 = (X-2) (2-x) + x ^ 2 + 2014 = - (x ^ 2-4x + 4) + x ^ 2 + 2014 = 4x + 2010 = 4 + 2010 = 2014 or: x ^ 3 + X-2 = 0 (x ^ 3-1) + (x-1) = 0 (x-1) (x ^ 2 + X + 1) + (x-1) = 0 (x-1) (x ^ 2 + X + 2) = 0, the solution is: x = 1

A basic solution system of homogeneous equations x1-x2 + X3 + X4 = 0 2x1 + x2-2x3 + 2x4 = 0

I have (1 / 3 - 4 / 3 10) transpose and (- 1 001) transpose

125:75 reduction ratio