Write the proposition "if (radical X-2) + (y + 1) ^ 2 = 0", then x = 2 and y = - 1 inverse proposition, no proposition, inverse no proposition, and judge their true and false

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• 1. In the rectangular coordinate system, the inverse proposition of point (x, y) and point (negative x, negative y) about the origin symmetry, and judge the truth of the original proposition and the inverse proposition
• 2. If x − 2 + (y + 1) 2 = 0, then x = 2 and y = 1, the inverse proposition, the negative proposition and the inverse negative proposition are written, and their true and false are judged
• 3. Write out the inverse proposition, no proposition and inverse no proposition of the proposition (if x square + y square = 0, then x = 0 and y = 0), and judge the truth
• 4. If proposition x = 3, then x ^ 2-7x + 12 = 0 and the number of its inverse proposition, no proposition, inverse no proposition and false proposition?
• 5. If x = 2, why is the inverse proposition of square - 3x + 2 = 0 false? Please give me a counterexample!
• 6. If x = 2, then the inverse proposition of x square - 5, x + 6 = 0 is no proposition, the inverse proposition is no proposition and the truth is judged
• 7. If y = x + 1, then y = 3 and x = 2. Find the truth of this proposition and its inverse proposition, no proposition, inverse proposition, x y belongs to Z Last time I asked a question. I'm sorry
• 8. The inverse proposition of the proposition "if xy = 1, then x and y are reciprocal to each other" is______ ．
• 9. Write the inverse proposition of "if xy = 6, then x = 3 and y = 2", no proposition, inverse no proposition rt And judge right and wrong
• 10. For positive numbers x and y, there are the following propositions: x + y = 2, then √ XY ≤ 1, if x + y = 3. Then √ XY ≤ three thirds, if x + y = 6, then √ XY ≤ 3 According to the above three propositions conjecture: 1 if x + y = 9, then √ XY ≤____ For any positive number a, B, there is always √ ab ≤____
• 11. Is the sum of two positive numbers always greater than each addend?
• 12. The inverse proposition of positive number greater than negative number is
• 13. Two numbers add to get a positive number. What are these two numbers A. There is at least one positive number B. There is at least one negative number C. Both are negative numbers D. Both are positive numbers
• 14. The absolute value of two opposite numbers (), on the contrary, the absolute value of two equal numbers () or ()
• 15. If the absolute values of two opposite numbers are equal, then the two numbers with equal absolute values are opposite to each other______ (fill in "correct" or "wrong")
• 16. What is the opposite number equal to the absolute value?
• 17. The number whose absolute value equals its opposite number is the absolute value of (), (), and the opposite number is equal to itself
• 18. Is the absolute value of two opposite numbers equal or wrong
• 19. The inverse proposition, no proposition and inverse no proposition that the square of any real number is nonnegative In this topic, "any" is a full quantifier. Can it become an existential quantifier when it is rewritten into the form of "if ~"? If it can be changed, how can it be changed
• 20. The square of real number is the inverse proposition of non negative number, no proposition, you no proposition, and judge whether it is true or false