4, 12, 24 and 40 are 8, 12 and 16 respectively.
8, 12, 16 is a arithmetic progression with a tolerance of 4. So the next number is 20,40+20 = 60, so the next number is a number different from 60 and 80, that is, 80+60= 140.
Second, add 1 to each item, that is, 64, 27, 8, 1,-1, -8. These five numbers are the cubic of 4, the cubic of 3, the cubic of 2, the cubic of 1 and the cubic of-1 respectively. So the next number is the third power of -3, which is -27.
The third question is similar to the previous one, it is 1, and the fifth item is the cubic of 5, 125.
Question 4, 8-8=0, 8-6=2 and 6-2=4.
0,2,4 is a arithmetic progression with a tolerance of 2, so the next number is 6, that is, the fifth term minus the fourth term equals 6, that is, -4.
It's done.