Observe the number table and fill in the "mouth" in the number table one 1 -1 1 -2 1 1 -3 3 -1 1 -4 6 -4 1 1-5 port-10 5-1 1-6 ports-20 15-6 1 Why? Why do you fill in this way?

ten
fifteen

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1. A number is not only a multiple of 3, but also a multiple of 5 and 7. The minimum number is ()
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5. , fill in 26 27 30 35 () () 1.6.7.12.13
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12. According to the following rule, form a number table with positive integers, then which row and number is 2008 in the table 1；2,3；4,5,6；7,8,9,10；………………
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15. Fill in the number of safety rules: 1 / 2, 8 / 13, 21 / 34, (), (), ()
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