for algebra, + times + equals -, - times - equals +, add finally two different signs equal -.
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Multiplication and addition are different mathematical operations with different rules. What is required for addition is not necessarily required for multiplication.
Yes.
Inverse and idenity
The rules for addition are as follows:The sum of two negative integers is a negative integerThe sum of two positive integers is a positive integerThe rules for subtraction are as follows:If they are two positive numbers, do it normallyIf there is a negative and a positive ,change it to addition and switch the SECOND integer sign
Addition, subtraction, multiplication and division