Given that the lengths of the ends of the three lines are 22, 16 and 18 respectively, which two line segments are diagonals and which line segments are edges, can parallelogram be drawn?

The meaning of this question is: which half of the two line segments can form a triangle with another line segment? The test is that the sum of the two sides of the triangle should be greater than the third side
There are three situations:
11. 8, 18, can form a triangle
11. 9, 16, can form a triangle
22, 8, 9, can not form a triangle
So when 22 and 16 segments are diagonals or 22 and 18 segments are diagonals, they can form parallelogram

Solution equation: X / 15 + 0.4 = x / 12-0.25

x/15+0.4=x/12-0.25;
4x+24=5x-15;
x=39;

Given function f (x) = - radical 3 / (x power of 3 + radical 3)
(1) Verification: when X1 + x2 = 1, f (x1) + F (x2) is the fixed value (2). Find the value of F (- 2) + F (- 1) + F (0) + F (1) + F (2) + F (3)

1. X2 = 1-x1, simplification,
f(x1)+f(x2)=-√3/(3^x1+√3)-√3/(3^(1-x1)+√3)=-1
2. According to the first question, the answer is - 3

If a rational number is not an integer, it is a fraction; if a rational number is not a positive number, it is a negative number; if an integer is not positive, it is a negative number; if a fraction is not positive, it is a negative number

1. A rational number is either an integer or a fraction; --- correct
2. A rational number is either positive or negative; --- error (and 0)
3. An integer is either positive or negative; --- error (and 0)
A score is either positive or negative

If f (x) = 1log12 (2x + 1), then the domain of F (x) is ()
A. (−12，0)B. (−12，+∞)C. (−12，0)∪(0，+∞)D. (−12，2)

According to the meaning of the question: 2x + 1 ＞ 02x + 1 ≠ 1, the solution is: - 12 ＜ x ≠ 0, so its definition domain is: (− 12, 0) ∪ (0, + ∞), so C

The reciprocal of a number is 8 / 9. What is 4 / 3 of the number

4 / 3 of this number = 9 / 8 × 4 / 3 = 3 / 2
The reciprocal of a number is 8 / 9, and 4 / 3 of the number is 3 / 2

The results are as follows: 1. X + y + Z = 26, X-Y = 1,2x-y + Z = 18, 2.5x + y + Z = 1,2x-y + 2Z = 1, x + 5y-z = 4

1) x+y+z=26---(1)x-y=1---(2)2x-y+z=18---(3)(1)+(2)==>2X+Z=27---(4)(1)+(3)==>3X+2Z=44---(5)(4)*2-(5)==>X=10,Z=7,Y=92) 5x+y+z=1--(1)2x-y+2z=1---(2)x+5y-z=4----(3)(1)+(2)==>7X+3Z=2---(4)(1)*5-(3)==>24X+6...

If the interval of the zeros of the function f (x) = - x3-3x + 5 is (k, K + 1), where k ∈ Z, find the value of K

f'=-3x²-3=-3（x²+1）＜0
If f (0) = 5 > 0, then the function intersects the x-axis at a point on the right of the origin, and the zero point is a ∈ (k, K + 1)
According to the decreasing function, f (k) > 0, f (a) = 0, f (K + 1) 0
f(1)=1>0
f(2)=-9

The parabola y = x ^ + X + 9 has an intersection with the X axis

The parabola y = x ^ + X + 9 has zero intersections with the X axis
Cause: B ^ 2-4ac < 0

Parabola y = ax ^ 2 + K (a > 0) opening direction, axis of symmetry, vertex coordinates
Y = a (X-H) ^ 2 + K (a > o) opening direction, axis of symmetry, vertex coordinates
Y = a (X-H) ^ 2 opening direction, axis of symmetry, vertex coordinates

Parabola y = ax ^ 2 + K (a > 0) opening direction, axis of symmetry, vertex coordinates
Up x = 0 (0, K)
Y = a (X-H) ^ 2 + K (a > o) opening direction, axis of symmetry, vertex coordinates
Up x = H (h, K)
Y = a (X-H) ^ 2 opening direction, axis of symmetry, vertex coordinates
Up x = H (h, 0)

Given that the lengths of the ends of the three lines are 22, 16 and 18 respectively, which two line segments are diagonals and which line segments are edges, can parallelogram be drawn?