Solving equation: 0 = - x square - 2x + 3

Solving equation: 0 = - x square - 2x + 3

（x+3)(x-1)=0
x1=-3,x2=1

Given that a is a known number, when a takes what value, the equation A's Square X's square-x's square + 2x-2ax-3 = 0 is a linear equation of one variable with respect to X

It is known that A. B belongs to R, the range of function f (x) = ax ^ 2 + BX + 1 is [0, + &] and f (- 1) = 0
(1) If the function g (x) = f (x) - KX, X belongs to [- 2,2] and is a monotone function, the value range of real number k is obtained

1、
f(-1)=a-b+1=0
b=a+1
So f (x) = ax & sup2; + (a + 1) x + 1
=a[x+(a+1)/2a]²+1-(a+1)²/4a
Minimum = 0
So 1 - (a + 1) & sup2 / 4A = 0
a²-2a+1=0
(a-1)²=0
a=1,b=a+1=2
2、
f(x)=x²+2x+1
g(x)=x²+(2-k)x+1
X belongs to [- 2,2] and is a monotone function
So the axis of symmetry x = - (2-k) / 2 is not in this interval
So - (2-k) / 22
So K6

The bottom of a ladder is 2cm more than God's, 5cm higher, and 40 square centimeters in area. I asked for 17.5cm higher and 17.5cm lower, which is wrong
My formula is: 9x + X + 2) * 5 / 2 = 40 2x + 5 = 40 2x = 35 x = 35 / 2 x = 17.5

Let the upper bottom be x, then the lower bottom be x + 2
Column formula:
[X+(X+2)]*5*(1/2)=40
(2X+2)*5=80
2X+2=16
X=7
1 / 2 is multiplied by 0.5 or divided by 2. You can write it yourself
A: the top and bottom are equal to 7
The return belt is completely correct
My elder sister, who is now in college,

Sequence 1 / 5,3 / 5,1,7 / 5 Item 11 of a11=

21/5

The 10th power of a plus the 8th power of B is equal to

10A plus 8B

One way flight between two cities takes 5 hours and 30 minutes in downwind and 6 hours in upwind. Given the wind speed of 24 kilometers per hour, the distance between two cities can be calculated

Let the speed of the aircraft be x km / h without wind
(x+24)*5.5=(x-24)*6
(6-5)x=(6+5.5)*24
X = 276 km / h
Distance between the two cities: (x-24) * 6 = (276-24) * 6 = 252 * 6 = 1512 km

One column number 1, 1, 2, 3, 5, 8, 13, 21 Starting from the third term, each term is the sum of the first two terms. What is the remainder of the 2000 term divided by 8?

Because the law of the remainder of this sequence divided by 8 is: 1, 1, 2, 3, 5, 0, 5, 5, 2, 7, 1, 0, 1, 1, 1, 2, 3 Its cycle period is: 1, 1, 2, 3, 5, 0, 5, 5, 2, 7, 1, 0; 2000 △ 12 = 166 8. In the cyclic number, the eighth number corresponds to 5, so the remainder of item 2000 divided by 8 is 5. A: the remainder of item 2000 divided by 8 is 5

The solution set of inequality (x-3) (x + 2) ≥ 0 is______ ．

Inequality (x-3) (x + 2) ≥ 0, can be reduced to X − 3 ≥ 0 x + 2 ≥ 0 or X − 3 ≤ 0 x + 2 ≤ 0, the solution is: X ≤ - 2 or X ≥ 3, so the answer is: {x | x ≤ - 2 or x ≥ 3}

English translation
Aron Ralston is an American man who is interested in
mountain climbing.As a mountain climber,Aron is used
to taking risks.This is one of the exciting things
about doing dangerous sports.There were many times when
Aron almost lost his life because of accidents.On April
26,2003,he found himself in a very dangerous situation
when climbing in Utah.
•On that day,
Aron’s arm was caught under a 360-Kilo rock that fell on
him when he was climbing by himself in the mountains.Because he could not free his arm,he stayed there for five
days and hoped that someone would find him.But when his
water ran out,he knew that he would have to do
something to save his own life.He wasn’t ready to die
that day.So he used his knife to cut off half his right
arm.Then ,with his left arm,he bandaged himself so
that he wouldn’t lose too much blood.After that,he
climbed down the mountain to find help,
•After losing
his arm,he wrote a book called Between
a Rock and Hard Place.This means being in a difficult situation
that you can’t seem to get out of.In this book,Aron
tells of the importance of making good decisions,and of
being in control of one’s life.His love for mountain
climbing is so great that he kept on climbing mountains
even after this experience.
•Do we have the
same spirit as Aron?Let’s think about it before we find
ourselves “between a rock and a hard place”,and before
we have to make a decision that could mean life or
death.

Aron Rolston is an American man interested
Climbing. As a climber, Aron uses
Adventure. It's an exciting thing
Do dangerous sports. Many times when
He almost lost his life because of the accident
In 2003, he found himself in a very dangerous situation
When climbing in Utah
• that day,
Aron's arm was dropped by a 360 kg rock
He climbed the mountain alone. Because he couldn't get his free arm, he stayed there for five years
God, I hope someone can find him. But when he does
The water ran out and he knew what he was going to do
Some save their lives. He's not ready to die
That day. So he cut off half of his rights with a knife
Arm. Then, bandage his left arm, himself
He won't lose too much blood. After that, he won't lose too much
Climb down the mountain for help,
• after losing
His arm, he wrote a book called between
Rock and hard place. It means in a difficult situation
You can't seem to get out. In this book, Aron
Describes the importance of making good decisions, and
He can control his life. He loves mountains
The mountaineering is so big that he keeps climbing
Even experience in this area
• we have
The same spirit as Aron? Let's think about it before we find it
Between our "dilemmas", between
We have to make a decision, which may mean birth or death
Death