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The first volume of the sixth grade mathematics looks for the law
6.25 2.5 1 0.4 0. 16

1 4 3 8 5 12 7

1 4 16 64 256 1024

The first line divides the first line by 2.5 to get the next number.

The second rule is that the first number plus the third number equals the second number, the third number plus the fifth number equals the fourth number, and the fifth number plus the seventh number equals the sixth number.

Moreover, the cardinal number of 1 3 5 7 is 4 8 12, which is 4 1 times, 2 times and 3 times.

The first number in the third line multiplied by 4 equals the second number, the second number multiplied by 4 equals the third number, and so on.