Find the rule 0.175 1.8 0.35 0.9 0.7 0.45 () ()

0.175 1.8 0.35 0.9 0.7 0.45 1.4 0.225
Multiply the number of units by 2 and divide the double digits by 2

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1. (1 / 10 + 1 / 100 + 1 / 1000 + 1 / 10000) / (1 / 100 + 1 / 1000) simple calculation
2. According to calculation, the thickness of 10000 sheets of paper is about 1 meter. Can you calculate the thickness of 1000 sheets of paper, 100 sheets of paper and 10 sheets of paper according to the thickness of 10000 sheets of paper?
3. 2+4+6+8.1000 .. .
4. Then 2 + 4 + 6 + 8 +. + 1000 = () Starting from 2, the sum of consecutive n even numbers is 2 + 4 = 6 = 2x3; 2 + 4 + 6 = 12 = 3x4; 2 + 4 + 6 + 8 = 20 = 4x5 Then the sum of N consecutive even numbers should be 2 + 4 + 6 + 8 +. = (). Then 2 + 4 + 6 + 8 +. + 1000 = ()
5. 2+4+6+8+.+1000+1002
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8. What formula is used in the simple calculation of 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 15?
9. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10.100 = how much, how to calculate with the formula
10. 1 / 8 + 1 / 7 =? 1 / 4 + 4 / 5 =? 1 / 6 + 1 / 4 =? If you want to make a formula, how can you teach me to calculate?
11. 2, 0. 6, 1. 8 (), ()
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13. 1.9.8.14.15.19
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18. 35 7 1 4 () () fill in the number according to the rule
19. Find the rules and fill in the blanks 1,1,2,2,4,4,7, (), ()
20. Find the rules, and then fill in. 1,3,4,7,11,18, (), (), ()