Given a (- 1,1), B (1,3), C (2,5), try to judge the position relationship of a, B, C

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• 1. The line a is parallel to B, B is parallel to C, D intersects with a at point m (2). Judge the position relationship between C and D, and explain the reason
• 2. It is known that, as shown in the figure, the straight lines a and B are cut by the straight line C, and ∠ 1 + ∠ 2 = 180 degrees. To prove that a is parallel to B, do you know how many methods to prove that a is parallel to B? To solve these problems, we must use the knowledge of grade two (including grade two)
• 3. As shown in the figure, a, B and C are on the same straight line, and ∠ 1 = 2, ∠ 3 = D. try to judge the position relationship between BD and CE, and explain the reason
• 4. As shown in the figure, AEB = NFP, M = C, judge the size relationship between a and P, and explain the reason
• 5. If n is known to be a rational number, does the value of quadratic trinomial n & # 178; - 4N + 5 have a maximum or a minimum? Please explain why Detailed answer steps. I am a student, 20 points reward!
• 6. Judgment: for any rational number, there are (a + b) &# 178; ≠ A & # 178; + B & # 178; But what if a and B are equal to 0 and 1 respectively?
• 7. If two non-zero rational numbers a and B satisfy the relation a + B = 0, can you judge whether their product a * B is positive or negative? If so, please explain the reason
• 8. Use 100 cm fence to form a round field. Please judge whether the area of the field is rational? Please explain the reason Well, I'm a student,
• 9. Is the sum of two rational numbers greater than the sum of two addends
• 10. If two rational numbers are added, is the sum greater than each addend? If two rational numbers are subtracted, is the difference necessarily less than the subtracted? Please explain the reason
• 11. Given three points a (1,3), B (- 2,0), C (12,4), try to judge whether these three points are on the same straight line, and explain the reason
• 12. (1 / 2) the first question is to judge the position relation of a (- 2,12), B (1,3), C (4, - 6) and explain the reason (1 / 2) question 1 judge the position relation of a (- 2,12), B (1,3), C (4, - 6) and explain the reason The second problem is to find the three dimensions of the line 2x-5y-10 = 0 and the coordinate axis
• 13. As shown in the figure, points a, B and C are on the same straight line, ∠ 1 = ∠ 2, ∠ 3 = ∠ D. try to judge the position relationship between BD and CF, and explain the reason
• 14. Judge the position relation of the following points and give the proof. (1) a (1,2) B (- 3, - 4), C (2,3.5) (2) P (- 1,2) Q (0.5,0) r (5, - 6)
• 15. Among the nine integers from 1 to 9, ABC [A is not equal to B, not equal to C] indicates what number can make the equation hold C divided by B = a divided by 1 = B divided by a
• 16. . integer 1
• 17. ABC three integers, satisfy a + B + C = 2001, and 1 Sum to get three numbers, and the original three numbers, a total of six.
• 18. If a three digit ABC satisfies ABC = a ^ 3 + B ^ 3 + C ^ 3, such as 153 = 1 ^ 3 + 5 ^ 3 + 3 ^ 3, it is called "wonderful number", and the sum of all numbers satisfying the condition is obtained
• 19. 30. Given a ^ 2 / 3 + B ^ 2 / 3 = 4, x = a + 3A ^ 1 / 3B ^ 2 / 3, y = B + 3A ^ 2 / 3B ^ 1 / 3, find (x + y) ^ 2 / 3 + (X-Y) ^ 2 / 3
• 20. Let 3A = 2, 3b = 5, let a and B denote the root of log (3) 30 Let 3A = 2, 3b = 5, try a and B to represent log3 √ 30