Let X1 and X2 be two of the equations x ^ 2-2008x-1 = 0, and find (x2) ^ 2 + 2008 / x1

Let X1 and X2 be two of the equations x ^ 2-2008x-1 = 0, and find (x2) ^ 2 + 2008 / x1

Answer 1
From the equation, X1 + x2 = 2008, X1 * x2 = - 1
Then (x2) ^ 2 + 2008 / X1 = (x2 * x2 * X1 + 2008) / X1 = (- x2 + X1 + x2) / X1 = 1

Given that X1 and X2 are the two roots of the equation x square + 2006X + 1 = 0, then (1 + 2008x1 + X1 Square) (1 + 2008x2 + x2 Square)
The value of is? Which of 1 or 2 or 3 or 4 is the answer?

Answer 4
=(square of 1 + 2006x1 + X1 + 2x1) (square of 1 + 2006x2 + x2 + 2x2) = (0 + 2x1) (0 + 2x2) = 4x1x2 = 4

Let X1 and X2 be the two real roots of the equation x2 + X-1 = 0, then x13-2x22 + 2008=______ ．

∵ x1, X2 are two real roots of the equation x2 + X-1 = 0, ∵ X1 + x2 = - 1; and ∵ x13 = x1x12 = X1 (1-x1) = x1-x12 = 2x1-1-2x22 = - 2 (1-x2) = - 2 + 2x2, ∵ x13-2x22 + 2008 = 2x1-1-2 + 2x2 + 2008 = 2 (X1 + x2) + 2005 = - 2 + 2005 = 2003

How many meters is a foot? How many centimeters is an inch?

1foot feet = 12inches = 0.3048metric meters, 1inch inches = 25.4millimeteres mm, other nonsense, the following three are often used, by the way: 1gallon = 4quarts quarts = 4.546litres (usually used for refueling) 1oounce ounces = 16drams, Dalan = 28.35gram

Xiao Ming finished reading a story book in three days. On the first day, he read 40% of the whole book. On the second day, he read the remaining 40%. On the third day, he read 12 more pages than on the second day
How many pages is the book?
emergency

100 pages

3 (AB-A) - (3ab-2b);. What is it equal to

3(ab-a)-(3ab-2b)
=3ab-3a-3ab+2b
=2b-3a

The car and the truck are facing each other. 1.3 hours later, the two cars are 168 kilometers apart. 2.5 hours later, the two cars meet on the way. How many kilometers are the two places apart

168 ÷ (2.5-1.3) = 140 km, then the sum of two vehicle speeds is 140 km / h
140 × 2.5 = 350 km
A: the distance between the two places is 350 km

If the length of two sides of a triangle is 4 or 7, and the length of the third side is the solution of equation 2 (x + 3) + 2 = 3x + 1, then the triangle is a () triangle

If the length of two sides of a triangle is 4 or 7, and the length of the third side is the solution of equation 2 (x + 3) + 2 = 3x + 1, then the triangle is an isosceles triangle
2（x+3)+2=3X+1
2x+6+2=3x+1
x=7

A car goes from city a to city B in four fifths of an hour. How many tenths of the journey can it take in two hours

It's all the way every hour
3 / 10 △ 4 / 5 = 3 / 8
Two hours will do the journey
3 / 8 × 2 = 3 / 4

Rational number B
Please, the answer is - 2. I've known it for a long time. The key is that the process should be detailed and clear

|a+b|-|b-1|-|a-c|-|1-c|
=-a-b+b-1+a-c-1+c
=-2