I am only good at math, so I only answer this part. As for Chinese, just a few words of nonsense, as long as it doesn't deviate from the center of actively facing setbacks.

This is the answer to the math part.

1 (9.3*2+9* 1)/3=9.2

In the part after the decimal point, the sum of adjacent two digits is 9.

3 If the number of cyclic digits is 3, then

I 30/3 = 10...0 is 7.

70/3 = 23... 1 is 3.