Find the rule 1 / 4, negative 1 / 3, 7 / 16, negative 13 / 25, 7 / 12 What is the eighth number?
1/4 3/9 7/16 13/25 21/36 31/49
Rule: the denominator is obvious, the square of n
Molecule: 3 = 1 × 2 + 1, 7 = 2 × 3 + 1, 13 = 3 × 4 + 1, 21 = 4 × 5 + 1, 31 = 5 × 6 + 1
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- 1. Find the rule: 6, 9, (), (), 8, 10 There are 3, (), (), 76, 3, 5, 3, 4, (), 9 () How do you write it?
- 2. There is a set of numbers: 5, 10, 15, 20, 25, 30. What rules do you find, expressed by the formula containing letters
- 3. 9-1 = 8 * 1 25-9 = 8 * 2 49-25 = 8 * 3 81-49 = 8 * 4, what rule do you find by observing the above formula? Express this rule with formula (letter)
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- 8. In rope skipping competition, the number of people is between 100 and 150. If they are divided into five people, six people and eight people, they are just finished. How many people are there in rope skipping competition?
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- 10. The number of students in class 51 is between 30 and 60. If they are divided into a group of four, a group of six, or a group of eight, then there are several students in class 51
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