The logarithm of the vertex angle formed by the intersection of three different lines on the plane is

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• 1. The three straight lines intersect each other to form a logarithmic relation to the vertex angle
• 2. When three straight lines intersect at the same point, there are M pairs of vertex angles; when three straight lines intersect at different points, there are n pairs of vertex angles, then the relationship between M and N is () A. m=nB. m＞nC. m＜nD. m+n=10
• 3. When three straight lines intersect at the same point, there are M pairs of vertex angles; when three straight lines intersect at different points, there are n pairs of vertex angles, then the relationship between M and N is () A. m=nB. m＞nC. m＜nD. m+n=10
• 4. When three straight lines intersect at the same point, there are M pairs of vertex angles; when three straight lines intersect at different points, there are n pairs of vertex angles, then the relationship between M and N is () A. m=nB. m＞nC. m＜nD. m+n=10
• 5. The following statement is correct: A. from the fact that the opposite vertex angles are equal, we can get that the equal angles are opposite vertex angles. B. two equal angles with common vertex are opposite vertex angles C. Two complementary angles with common vertices are adjacent complementary angles D. If two angles are opposite vertex angles, they must be equal
• 6. It is known that the complementary angle of angle A and the opposite vertex angle of angle B complement each other. When a = 40 degrees, angle B =?
• 7. A. The equal angle is the opposite vertex angle B. the shortest line between two points C. two lines are cut by the third line, and the internal stagger angles are equal D. in the same plane, parallel to Which proposition is correct when two lines of the same line are parallel
• 8. If two pairs of vertex angles complement each other, the two lines forming the two angles are perpendicular to each other
• 9. Two complementary angles cannot be opposite vertex angles
• 10. If two angles are opposite vertex angles and complementary, then the degrees of the two angles are______ ．
• 11. Law of logarithm: straight lines intersect at one point, two intersect, there are two pairs of logarithm of vertex angle, and six pairs of logarithm of adjacent complementary angle Straight lines intersect at one point and two intersect. There are two pairs of logarithms of vertex angles and six pairs of logarithms of adjacent complementary angles And so on, how many pairs of vertex angles do n lines intersect
• 12. (1, 2, 3, 4. N) how many logarithms of vertex angle are there when the lines intersect at a point? What is the law? Online, etc
• 13. Can the square of x plus 2, the square of XY plus y be calculated by the complete square formula
• 14. Hello: how about X (X-Y) ^ 2-y (Y-X) ^ 2 x ^ 2 / 4 + XY + y ^ 2 using the square difference formula?
• 15. The square of X + 4xy + 4Y is equal to? (factorization)
• 16. Ask for the sum of the reciprocal sequence of natural numbers, 1+1/2+1/3+1/4+ … +Sum of reciprocal sequence of 1 / n natural numbers And 1 + 1 / (2 * 2) + 1 / (3 * 3) + 1 / (4 * 4) + +Sum of reciprocal square sequence of 1 / (n * n) natural number ～ Many people say it can't be solved Another point I ask is the sum of the first n terms, not the limit. But others say it's →∞ I don't understand why the sequence 2481632... 2yn is also →∞, but the sum of the first n terms can be obtained?
• 17. How to find the sum of reciprocal squares of natural numbers?
• 18. What is the formula of whole column summation or whole row summation in excel? How to find the average?
• 19. The sum formula of 2N-1 and 2n + 1 natural numbers
• 20. Sequence 1.3.9.15.21. The nth number is