2. The difference between the number after c and the number before c is 1.248 1.6, that is, 2 is the fourth power of 0.
3. The fourth power of c1,the third power of 3, the first power of 4 and the zeroth power of 5.
4. The number after d minus the previous number is 18 36 72 144, that is, the difference between the last two numbers is twice that of the first two numbers.
5.d 0 = 1 3- 1 9 = 2 3+ 1 26 = 3 3- 1 65 = 4 3+ 1， 124 = 5 3-6524。
6. The odd digits of c are sequentially reduced by 4, and the even digits are sequentially increased by 3.
7.c 20/9 4/3 = 24/ 18 7/9 = 28/36 4/9 = 32/72 1/4 = 36/ 144 5/36 = 40/288