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______ ．

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• 1. If you take any one of the three digits of 3, 2 and 1, what is the possibility of getting an even number______ ．
• 2. How many four digit numbers are composed of 1.2.3.4.5 without repetition? How many even numbers are there?
• 3. Use the five numbers 1.2.3.4.5 to form a three digit number without repetition. How many even numbers are there?
• 4. 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?
• 5. 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
• 6. 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 ()
• 7. A three digit number is not only a multiple of 3, but also a factor of 5. If the number is odd, the minimum number is (?), and the maximum even number is (?)
• 8. A two digit number contains a factor of 3 and a multiple of 5. If the number is odd, what is the maximum; if it is even, what is the minimum I can't help you
• 9. Within 100 is not only a multiple of 3, but also a factor of 5, in which the largest odd number is (), and the smallest even number is ()
• 10. An odd number is a 2-digit multiple of 5. The sum of all its factors is 48. What is the number?
• 11. The second section of chapter two in the eighth grade mathematics Dictionary (Beijing Normal University Edition) had better have a process
• 12. Calculation: 27-12 + 4 / 3
• 13. Calculate 15 × (- 3 / 5 + 1 / 3) - 27 × (1 / 6-5 / 12)
• 14. Comparison table of square root and arithmetic square root
• 15. Square root 3 [3x-2] = [2-3x] [x + 1] factor square root emergency
• 16. If x-3 and 3x-5 are the square roots of the same number, then the value of X is
• 17. 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
• 18. 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______ ．
• 19. 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?
• 20. 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