The sum of the largest seven bits and the smallest eight bits is 1999999, and the difference is 1.

The explanation is as follows:

The largest seven digits are 999999, and the smallest eight digits are1000000;

Their sum is: 9999999+1000000 =1999999;

Their difference is: 1000000-999999 = 1.

Sum and difference calculation method

1. Sum (i.e. addition): Find the sum of two or more numbers.

Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number and quantity. The addition symbol is the plus sign (+). Connect items with a plus sign when adding. Put and after the equal sign (=). ? Example: If the sum of 1, 2 and 3 is 6, it is written as 1+2+3 = 6. Addition is divided into decimal addition, decimal addition and integer addition.

Second, the difference (that is, subtraction): find the total number of subtraction between two or more numbers.

Subtraction is one of the four operations, and the operation of subtracting one quantity from another is called subtraction; Given the sum of two addends and one of them, the operation of finding the other addend is called subtraction. The symbol of subtraction is "-",which is pronounced as negative sign. Used to calculate decrement. "-"is the minus sign, the number before the minus sign is the minuend, the number after the minus sign is the minus sign, "=" is the equal sign, and the number after the equal sign is 10000 (minuend)-(minus sign) 6000 (minus sign) = (equal sign) 4000 (difference).