An object is acted by a common point f1.f2.f3. It is known that F1 = 6N, F2 = 7n, F3 = 8N. If the direction of F1 and F2 is the same, the minimum value of the resultant force of the three forces is?

An object is acted by a common point f1.f2.f3. It is known that F1 = 6N, F2 = 7n, F3 = 8N. If the direction of F1 and F2 is the same, the minimum value of the resultant force of the three forces is?

5N.
The direction of F3 is opposite to that of F1F2
F = F1 + f2-f3 = 5N

Write a general term formula of sequence 0,1,0,2,0,3 ·

An = 0 (n is odd)
An = n / 2 (n is even)

1 / 3 of a number is 12.5 less than 1 / 2. What's 20% of this number?

This number is 12.5 (1 / 2-1 / 3) = 75
75×20%=15

What is the form of prime multiplication for 36?

36=2×2×3×3

Let f (x) = |x + 1 | + |x-2 | + A under the root sign
If the definition field of function f (x) is r, try to find the value range of A

The solution holds for | x + 1 | + | X-2 | ≥ 0
That is, if we want to make | x + 1 | + | X-2 | + a meaningful under f (x) = root sign, and the definition field of function f (x) is r,
That is, there must be a ≥ 0

What are the numbers in - 22, - 17, - 12, () - 3, 3?
No wrong number, I just can't think of it

Are you sure you have the right number? If it's - 2,3, (- 7). The difference between two adjacent numbers

At 1, 2, 3 Among the 30 natural numbers 29 and 30, the sum of any two different numbers is not a multiple of 7
At 1, 2, 3 Of the 30 natural numbers 29 and 30, the most can be taken_____ So that the sum of any two different numbers is not a multiple of 7
Seven is double seven? So 7 can't take it!

The sum of any two different numbers is not a multiple of 7
That is to say, the sum of the remainder of two numbers divided by 7 cannot be 7 or 0
So if you divide by 7, the sum of 1, 2, 3 will not be a multiple of 7
So there are 14 (1 2 3 8 9 10 16 17 22 24 29 30)
There are also seven, because there is only one multiple of seven plus any number will not become a multiple of seven
So the maximum number is 15

Why can't the formula of static friction be FF = UFN (pressure)

That's dynamic friction

875 is a fraction
Fractional fraction

7/8

The sum of the largest divisor and the second largest divisor of a natural number is 111______ ．

Because 111 is odd, and odd = odd + even, the maximum divisor and the second approximation of the number must be an odd even. The maximum divisor of a number is itself. If a number has an even divisor, the number must be even, and the second approximation of an even number should be 12 times of the even number. If the second approximation is a, the maximum divisor is 2a, then: a + 2A = 111 & nbsp; & nbsp; So the answer is: 74