![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
What is the greatest common factor of 30 and 20______ The least common multiple is______ The greatest common factor of 21 and 7 is______ The least common multiple is______ ．
(1) 30 = 2 × 3 × 520 = 2 × 2 × 5, so the greatest common factor of 30 and 20 is 2 × 5 = 10, and the least common multiple is 2 × 5 × 3 × 2 = 60; (2) 21 = 3 × 77 = 1 × 7, so the greatest common factor of 21 and 7 is 7, and the least common multiple is 7 × 3 × 1 = 21; so the answer is: 10, 60; 7, 21
RELATED INFORMATIONS
- 1. Find the slope and inclination of the line passing through each of the following two points （1）C(10,8)、D(4,-4) (2) P (0,0) Q (- 1, radical 3) (3) M (- radical 3, radical 2) n (- radical 2, radical 3)
- 2. How to combine favorite, are, banana, my, fruit (.) into sentences
- 3. If the ordinate of the lowest point of the parabola y = (m-1) x2 + 2mx + 2m-1 is zero, then M=______ ．
- 4. The derivative problem is solved by F (x) = x ^ 3 + 3ax-1, let a = - m ^ 2, when the real number m changes in what range, y = f (x) and y = 3 have only one common point? The first floor is not right at all.
- 5. Let the linear parameter equation x = 5 + 3T, y = 10-4t, ① solve the rectangular coordinate equation of the straight line, ② change it into the standard form of the parameter equation
- 6. Solving 10 mixed fraction operation problems in grade two of junior high school
- 7. As shown in the figure, it is known that the parabola y = 1 / 2x ^ 2 + MX + n (n ≠ 0) intersects the straight line y = x at two points a and B, intersects the Y axis at point C, OA = ob, and AC ‖ X axis As shown in the figure, it is known that the parabola y = 1 / 2x ^ 2 + MX + n (n ≠ 0) intersects with the straight line y = x at two points a and B, intersects with the Y axis at point C, OA = ob, and AC ‖ X axis (1) finds the functional relationship corresponding to the parabola (2) let D and E be two moving points on the line AB different from a and B (point E is above d). De = √ 2, make parallel lines of Y axis respectively through D and E, intersect the parabola and FG, if the abscissa of point D is x, the area of the quadrilateral degf is y, and, Try to find the relationship between Y and X and the value range of X
- 8. Given that X1 and X2 are the two roots of the equation x & # 178; - 4x + 2 = 0, find the value of (x1-x2) &# 178
- 9. It is known that the line AB, a (6,0) and point B move on the curve c y = x ^ 2 + 3, and the trajectory equation of point P in AB is obtained
- 10. Given the binary linear equation 2x + y = 7 (1), the equation is written in the form of Y expressed by the algebraic expression of X (2), and the positive integer solution of the equation is obtained
- 11. In the triangle ABC, ab = AC, D is the midpoint of AC. BD divides the perimeter of the triangle ABC into two parts, 12cm and 9cm, and calculates the three sides of the triangle ABC There seem to be two answers
- 12. How do two 3S and two 7S equal 24
- 13. How to do with 7, - 7 and two three results equal to 24 My question is wrong. But there was an answer.
- 14. 6. How can 6, 8, 1 be equal to 24,
- 15. How do you calculate it to be 24
- 16. 7.9.4.1 how to calculate equal to 24 Anyway
- 17. -How about 9 - 6 2 7 equal to 24
- 18. 1.2.7.7 how do four numbers equal 24
- 19. How can 10 5 4 7 be equal to 24
- 20. 5 7 3 6 these four numbers are equal to 24