Try to determine the single digit of 8888 2222 7777 3333

8888 2222 has the same single digit as 8 2222.

The single digit of 8 n (n is a natural number) has 、...The law of repetition.

The remainder of 2222 4 is 2, so 8 2222 has the same single digit as 8 2.

So: the single digit of 8888 2222 is 4

7777 3333 has the same single digit as 7 3333.

The single digit of 7 n (n is a natural number) has 、...The law of repetition.

The remainder of 3333 4 is 1, so 7 3333 is the same as the single digit of 7 1.

So: 7777 3333 has a single digit of 7

So: the single digit of 8888 2222+7777 3333 is 1

Therefore, the single digit of the result obtained by the original formula is 1+6=7

The single digit depends on the last digit, and the single digit of the power of 8 is 8, 4, 2, 6, 8, 4, 2, 6 four cycles.

2222 divided by 4 to balance 2

Therefore, the single digit of 8888 to the power of 2222 is 4, and the single digit of the power of 7 is 7, 9, 3, 1, 7, 9, 3, 1 four cycles.

3333 divided by 4 and 1

So the single digit of 7777 to the power of 3333 is 7

4+7=11, so the single digit is 1

The power of 8 is , followed by these four number cycles, 2222 4 remainder is 2, so the single digit of 8888 2222 is 4; The power of 7 is , and the next is the cycle of these four numbers, 3333 4 remainder is 1, so 7777 3333 single digit is 7. The single digit of the sum is 7 + 4 = 11 single digit 1. So, the single digit is 1.

and the same single digits.

The single digit of 8 n (n is a natural number) has 、...The law of repetition.

The remainder of 2222 4 is 2, so.

and the same single digits.

So: 8888 2222

The single digit is 4

and the same single digits.

The single digit of 7 n (n is a natural number) has 、...The law of repetition.

The remainder of 3333 4 is 1, so.

and the same single digits.

So: 7777 3333

The single digit is 7

So: the single digit of 8888 2222+7777 3333 is 1

The power of 8 is , followed by these four number cycles, 2222 4 remainder is 2, so the single digit of 8888 2222 is 4; The power of 7 is , and the next is the cycle of these four numbers, 3333 4 remainder is 1, so 7777 3333 single digit is 7. The single digit of the sum is 7 + 4 = 11 single digit 1. So, the single digit is 1.

Yes, the sum of the single digits of 599 and the single digits of 111 is 10,888 and 222, 777 and 333,666 and 444, and the remaining 555,999,888,777,666,444,333,222,111 is added to the single digit of 0, and the remaining 555 single digits are 5, and the 0 (single digit of 999 + 111) + 0 (the single digit of 888 + 222) + 0 (the single digit of 777 + 333) + 0 (the single digit of 666 + 444) +5 (555) = 5 i.e. 0 + 0 + 0 + 0 + 5 = 5, right?

Single-digit carrying Li He Zheng character rule: 3,9,7,1 cycle.

Its single digit is the single digit of the first term, which is late by 3

Choose A, four groups of a cycle, 2013 The remainder of 4 is 1, so it should be 3

If the eight-digit number 66277xy7 is divisible by 33, then:

6+6+2+7+7+7+x+y can be divided by 3, i.e. 35+x+y is divisible by 3 (6+2+7+y)-(6+7+x+7)=y-x-5 or (6+7+x+7)-(6+2+7+y)=5+x-y is divisible by 11 and x, y is a number between 0 and 9

In summary, x=4, y=9

That is, the maximum value that xy can represent is 49