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Junior high school math problem: define rational numbers A and B as follows: a*b=(a-b)-(a+b), and find the value of (-3)*(-5). What does the symbol * mean? )
(-3)*(-5)=[-3-(-5)]-[(-3+(-5)]

=(2)-(-8)

= 10

"*" here is to define an arithmetic method. For example, "x" is an artificial operation mode, which means "multiplication". This symbol is also man-made, so you don't have to think about the meaning of this symbol because it has been told how to operate it here.

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