The fourth power of 1 + the fourth power of 2 + the fourth power of 3 + What is the single digit of the fourth power of 1998 + the fourth power of 1999

The fourth power of 1 + the fourth power of 2 + the fourth power of 3 + What is the single digit of the fourth power of 1998 + the fourth power of 1999

If the number is 1 on the digit, the digit to the fourth power is still 1
It's a number of 2 on the one bit, a number of 6 on the fourth power on the one bit
It's a number of 3 on the one bit, and it's a number of 1 on the fourth power on the one bit
If the number is 4, the number to the fourth power is still 6
It's a number of 5 on the one bit, and it's a number of 5 on the fourth power on the one bit
It's a number of 6 on the one bit, and it's a number of 6 on the fourth power
It's a number of 7 on the one bit, a number of 1 on the fourth power on the one bit
If the number is 8, the number to the fourth power is still 6
It's a number of 9 on the one bit, a number of 1 on the fourth power on the one bit
A number that is 0 on one bit, 0 on the fourth power
From 1 to 1999, every ten numbers is a cycle, the last cycle is only 1-9, but 0 does not affect the result
It's 200 cycles
Because we have to multiply it by 200, we can know that the final result must be 0