1,2,3,5,6,7,10,14,15,21,30,35,42,70105 and 210 have several primes

1,2,3,5,6,7,10,14,15,21,30,35,42,70105 and 210 have several primes

Four prime numbers, 2,3,5,7

There are two prime numbers. Our sum is 20 and our product is 21. Guess what these two numbers are

Well, it's impossible
The product of 21 is only 3 and 7

There are two prime numbers whose sum is 10 and product is 21. These two prime numbers are______ 、______ ．

21 = 3 × 73 + 7 = 10, that is, the two prime numbers are 3 and 7 respectively

We are two prime numbers. Our sum is 10 and our product is 21. What are we?

Decompose 21 into prime factor: 21 = 3 × 7, so the two prime numbers are 3 and 7

Let f (SiNx + cosx) = sinxcosx, then what is the value of F (cox30)?

f=sin2x/2
F (sin (x + 45)) = sin2x * (radical 2 / 2)
So sin (x + 45) = cos30, x = 15
F (x) = radical 2 / 4

The intersection of the line y = 2x + m and the line y = 3x + 3 is in the second quadrant. How to get the intersection (M-3, 3m-6)
Please attach complete analysis!

By y = 2x + M
y=3x+3
The intersection point is (m-3,3m-6)
Because the intersection is in the second quadrant
m-30
two

If x > 0, f (x) = - 2x & sup2; + 3x + 1,
1. Find the value of F (0)
2. Find the expression of F (x) when x is less than 0
3. Find the expression of F (x) on real number set R

1) Because the function is odd, f (0) = 0
2) X0, so,
f(x)=-f(-x)=-[-2(-x)^2+3(-x)+1]=2x^2+3x-1
3)
{ 2x^2+3x-1(x0)
(piecewise function)

Is (A & # 178; + 1) - & # 179; = 1 / (A & # 178; + 1) & # 179; and (a + b) & # 186; = 1 correct? Why

Hello
(A & # 178; + 1) - & # 179; = 1 / (A & # 178; + 1) &# 179; correct
(a + b) & # 186; = 1, a + B ≠ 0
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The function f (x) defined on R, if (x-1) f '(x)

F (x) is convex on (0,2)
Then f (0) + F (2) > 2F (1)
Hope to help, you're welcome!

The absolute value of minus five-thirds minus the absolute value of minus 20-thirds

15 percent