Comparison table of square root and arithmetic square root

There are two square roots, and there is only one arithmetic square root; the square root is a pair of opposite numbers, and the arithmetic square root is a non negative number; only non negative numbers have square roots and arithmetic square roots

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1. Calculate 15 × (- 3 / 5 + 1 / 3) - 27 × (1 / 6-5 / 12)
2. Calculation: 27-12 + 4 / 3
3. The second section of chapter two in the eighth grade mathematics Dictionary (Beijing Normal University Edition) had better have a process
4. The numbers 2, 3, 7 and 8 can be made up______ There are four digits without repetition, in which the possibility of the singular is______ What's the possibility of even numbers______ ．
5. If you take any one of the three digits of 3, 2 and 1, what is the possibility of getting an even number______ ．
6. How many four digit numbers are composed of 1.2.3.4.5 without repetition? How many even numbers are there?
7. Use the five numbers 1.2.3.4.5 to form a three digit number without repetition. How many even numbers are there?
8. Use the numbers 0, 1, 2, 3 and 4 to form a five digit number without repetition, then how many even numbers are adjacent to the numbers 1 and 2?
9. Use the five numbers of 0, 1, 2, 3 and 4 to form the five digit number without repetition, in which the even number has
10. A three digit number is not only a multiple of 3, but also a factor of 5. If the number is odd, the minimum is (), if it is even, the maximum is ()
11. Square root 3 [3x-2] = [2-3x] [x + 1] factor square root emergency
12. If x-3 and 3x-5 are the square roots of the same number, then the value of X is
13. It is known that ABC is a real number and B + C of a = C + a of B = a + B of C = K? If the title, seek detailed explanation
14. When the point m (x, y) moves in the triangle ABC (including boundary) as shown in the figure, the optimal solution of the maximum value of the objective function z = KX + y is (1,2), then the value range of the real number k is______ ．
15. Given that the image of the function y = | x2-1 | X-1 has exactly two intersections with the image of the function y = KX, then the value range of the real number k is Function y= |x2-1| x-1 = |x+1| • |x-1| x-1 = x+1 ,x＞1 -(x+1) ,-1≤ x＜1 x+1 ,x＜-1 x+1 ,x＞1 -(x+1) ,-1≤ x＜1 x+1 ,x＜-1 How did you get here?
16. If the function f (x) = x2 + 2 (A-1) x + 2 is a decreasing function on (- ∞, 4], then the value range of real number a is () A. a≤-3B. a≥-3C. a≤5D. a≥5
17. Given that FX = √ 3-ax / A-1 (a ≠ 1), if FX is a decreasing function in the interval (0,1), then the value range of real number a is? Given FX = √ 3-ax / A-1 (a ≠ 1), if FX is a decreasing function in the interval (0,1), then the value range of real number a
18. In quadratic function y = - x2-2x + 3, the value range of independent variable x
19. When k is a value, the domain of the function y = KX + 2 / KX ^ 2 + 4kx + 3 is all real numbers
20. If the function y = the independent variable of [KX's Square - 6kx + K + 8] under the root sign, take all real numbers and find the value range of constant K