The result in the problem is 300, assuming that the minuend is A, the minuend is B and the difference is A-B, then their sum is a+b+(a-b)=600, and A is equal to 300.
Subtraction is one of the four operations, and the operation of subtracting another number or quantity from one number or quantity is called subtraction. The minuend is the number that is subtracted. The mathematical method of subtracting one number or quantity from another can be summarized as m-s=r, where m is the minuend, s is the subtraction and r is the difference.
Extended data
The significance of rational number subtraction is the same as that of elementary school subtraction. When two numbers are known and one of them is added to find the other, it is called subtraction. Subtraction is the inverse of addition. In elementary school, the minuend was greater than the subtraction. After introducing negative numbers, any two numbers can be subtracted.
A rational number minus a number equals to the reciprocal of this number, which can be expressed as: a-b=a+(-b). In the subtraction of rational numbers, the operation of subtracting large numbers from decimals cannot be simplified directly as in primary schools, but converted into addition, and the key is to correctly convert subtraction into addition, and then calculate according to the addition law and operation law of rational numbers.
Baidu encyclopedia -minend