Given that y = f (x + 2) is an even function of the domain on R, and if x ≥ 2, f (x) = 3 ^ X-1, then the value of F (1) is Given that y = f (x + 2) is an even function of the domain on R, and if x ≥ 2, f (x) = 3 ^ X-1, then the value of F (1) is A .2 B.-8\9 C.8 D.26

Given that y = f (x + 2) is an even function of the domain on R, and if x ≥ 2, f (x) = 3 ^ X-1, then the value of F (1) is Given that y = f (x + 2) is an even function of the domain on R, and if x ≥ 2, f (x) = 3 ^ X-1, then the value of F (1) is A .2 B.-8\9 C.8 D.26

Y = f (x + 2) is the even function of the domain on R,
Then f (x + 2) = f (- x + 2),
therefore
f(1)=f(-1+2)=f(1+2)=f(3)=3^3-1=26.
Select [D]

If f (x) is an even function, its domain of definition is R and it is a decreasing function on [0, + ∞), then the relationship between F (- 34) and f (a2-a + 1) is positive______ ．

∵ a2-a + 1 = (A-12) 2 + 34 ≥ 34, ∵ f (x) is a decreasing function on [0, + ∞], ∵ f (a2-a + 1) ≤ f (34). Also, f (x) is an even function, ∵ f (- 34) = f (34). ∵ f (a2-a + 1) ≤ f (- 34), so the answer is: F (a2-a + 1) ≤ f (- 34)

What are the uncountable nouns of food? It's better to learn the uncountable nouns from grade one to grade seven!
Better have more

Vegetables: countable: tomato, tomato, cucumber, uncountable: garlic, celery
Fruit: countable: banana / apple not countable: except fruit itself, almost all other nouns are countable
Drink: countable: almost all of them are uncountable. How to count the water quality
Meat, pork, beef, duck, fish, chicken
Seasoning: salt, sugar, sugar, etc

Was she shooting her dog's name at the time swimmer.Allen Is the same Go to (a synonymous word)

1. Was she shooting her dog's name at the time swimmer.Allen Is the same John is a hammer as popular as Allen. 3. Go to

At least one of the numerator and denominator of the simplest fraction is prime ()
judge

One eighth of five meters is as long as five eighth of one meter
At least one of the numerator and denominator of the simplest fraction is prime (wrong)

English translation
Tom gets on the bus to go to town.It 's very crowded.He sits down next to a fat woman.She has several shopping bags and Tom doesn't have much room on the seat.
He isn't comfortable .At last the bus gets to the town.All the passengers start to get off.Tom is very polite,so he stands up to let the fat woman get off before him.She says,"Thank you."Then she tries to get out of the seat with all her bags.But she can't move,she is stuck.
Tom has to push the woman .The condustor pulls her.Finally they get her free but shi isn't pleased.
"I'll write to the bus conpany,"she says."I'll tell them not to make buses with such small seats!"

Tom went to town by car. Next to him sat a fat woman, who had a lot of shopping bags, so Tom didn't have a lot of space. Tom felt uncomfortable. Finally, the car fell down in town, and all the passengers began to get off. Tom stood up very politely and let the fat woman get off first. The fat woman said thank you to him

15. The least common multiple of 18 and 30 and the least common multiple of 12, 30 and 48
If you want the answer of the least common multiple, you should also use short division

15 = 3 * 5 18 = 3 * 3 * 2 30 = 3 * 5 * 2, so the least common multiple is 3 * 3 * 5 * 2 = 90
12 = 3 * 2 * 2 30 = 3 * 5 * 2 48 = 3 * 2 * 2 * 2 * 2, so the least common multiple is 3 * 2 * 2 * 2 * 2 * 5 = 240

I want to know how the X of 3x-2y + 1 = 0 equals - 9

Who said x = - 9?
Here an equation has two unknowns
There are countless solutions
3x=2y-1
x=(2y-1)/3
If you take any y, there will be a corresponding X
Obviously, when y = - 13, x equals - 9

It is known that ABC is not equal to zero, and ABC < 0, a + B + C > 0, a / A + B / B + C / C
It is known that ABC is a rational number not equal to zero, and ABC > 0, a + B + C > 0, a / A + B / B + C / C

Let me first answer the first question: ABC < 0, a + B + C > 0. We can know that only one of a, B, C is negative. Suppose a is negative, then a / A + B / B + C / C = - 1 + 1 + 1 = 1

Uncle Zhang has three fifths more chickens than ducks. There are 800 chickens and how many ducks

800 ÷ (1 + 3 / 5) = 500