When the magnitude of two common forces F1 and F2 is the following group of data, the resultant force cannot be 3N () A. F1=7N，F2=4NB. F1=3N，F2=8NC. F1=2N，F2=4ND. F1=2N，F2=1N

When the magnitude of two common forces F1 and F2 is the following group of data, the resultant force cannot be 3N () A. F1=7N，F2=4NB. F1=3N，F2=8NC. F1=2N，F2=4ND. F1=2N，F2=1N

The resultant range of two forces in common The value range of resultant force is: F1 + F2 ≥ f ≥ | F1-F2 | a, F1 = 7n, F2 = 4N, the value range of resultant force is: 3N ≥ f ≥ 11n, so a is possible. B, F1 = 3N, F2 = 8N, the value range of resultant force is: 5N ≥ f ≥ 11n, so B is impossible. C, F1 = 2n, F2 = 4N, the value range of resultant force is: 2n ≥ f ≥ 6N, so C is possible. D, F1 = 2n, F2 = 1n, the value range of resultant force is If n ≥ f ≥ 3N, then D is possible

Solving equation (x + 1 + 2 + 3) x = 55

X^2+6X-55=0
(X+11)(X-5)=0
X=-11
X=5

Find the rule 15.5.12.5.9 what's the next number

5,6,5,3,5,0,5.
I hope it will be helpful to you

Which two two digit prime number is 168 and the last digit of one of them is 1?
This is Goldbach's conjecture. I don't know how to solve it
Which two, the sum of two digits (prime numbers) is 168, and the last digit of a number (prime number) is 1

71 and 97

Given that the function y = f (x) is odd and x > 0, f (x) = x ^ 2-2x + 3, the analytic expression of F (x) on R is obtained

Because f (x) is an odd function, when x = 0, f (x) = 0
When x ＜ 0, - x ＞ 0
Then f (- x) = x ^ 2-2x + 3 = - f (x)
So f (x) = 2x-x ^ 2 + 3
therefore
When x > 0, f (x) = x ^ 2-2x + 3
When x = 0, f (x) = 0
When x < 0, f (x) = 2x-x ^ 2 + 3

China, I'd like to ask you some questions!
1. (Xiehouyu)____________ After hard training, Li Ming's sports performance has improved
You can't take care of yourself and boast that you can take care of others. It's a shame_____________
I had a hard time looking for this school seal. I almost searched the whole room, but I couldn't find it. I opened my pencil case and had a look. I didn't expect it to be here. It's really beautiful_______ .
2. We walked into the fruit trees of () and the flowers were intoxicating
3. The water is bright and sunny, and the mountain is clear and rainy. It describes the water of the West Lake_____ Or_____ The scenery under the beautiful weather
4. The Yellow River is_____ The Yellow River is_______ The Yellow River is_______ (figurative, anthropomorphic)
5. Li Xiaoming flinches when he meets difficulties, his father encourages him________ (verse, proverb, proverb)
The melodious sound of the piano came from afar. I listened and thought. I admire the player very much. He is really beautiful_________ !
When the wheat is finished, it's time to be relieved, and go to fertilize and water the autumn seedlings as soon as possible___________ Summer and autumn are on their shoulders______ () _________ ()
6. Changing radicals to form words______ () times________ ()
______ () __________ ()
7. Burning down the mountain____ How many trees have been destroyed______ My Lord is not here_______ Yunli self ignition_______ (answer one word)
Air terminal_____ Calm and calm_____ Thawing of rivers and lakes_____ Thousand mile Gobi_____ Communism____ (name of Chinese city) so many for the time being, I can't get 50 points, please forgive me!

After hard training, Li Ming's sports performance has improved. You can't take care of yourself and boast about taking care of others. It's really (shameful). I've been looking for this school badge so hard that I can't find the whole room

Group natural numbers from 1 as follows: (1), (2, 3, 4), (5, 6, 7, 8, 9), (10, 11, 12, 13, 14, 15, 16) According to this rule, the seventh number in group 15 is______ ．

142 + 7 = 196 + 7 = 203

The equation (K-2) x ^ 2 + KX + 1 = 0 is a linear equation of one variable about X. find the solution of X

The equation (K-2) x ^ 2 + KX + 1 = 0 is a linear equation of one variable with respect to X
∴k-2=0
k=2
Substituting into the original equation, we get 2x + 1 = 0
2x=-1
x=-1/2

①54÷9=6
②5.4÷9=0.6
③5.4÷0.9=6
④5.4÷0.09=60
How to find out the answer of 4 at once

Because 54 to 5.4 is reduced by 10 times, and 9 to 0.09 is reduced by 100 times. Let them multiply their reduction by 1000 times

At least one of any three continuous natural numbers is even. Please explain it with drawer principle
Be quick;'lk; L;

Odd and even numbers are two continuous drawers. For three continuous natural numbers, no matter the odd or even number is taken as the first number, at least one will fall into the even number drawer