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What do all the real numbers in the math problem mean? Range?
Real numbers correspond to imaginary numbers. Real numbers refer to all numbers that can be represented on the number axis, including rational numbers and irrational numbers.

Imaginary number is a number that cannot be expressed on the number axis, and can be expressed in other ways. For example, the square of what number is equal to-1, that is an imaginary number.

Simply put, all numbers that can represent size are real numbers.