This document discusses the properties of complex numbers, noting that a complex number consists of a real part and an imaginary part. It explains that addition and multiplication can be performed on complex numbers using the same rules as real numbers but taking into account the imaginary unit i, where i^2 equals -1. The document also states that every complex number can be expressed in the form a + bi, where a is the real part and b is the imaginary part.

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3. is a
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4. a + b√
is a
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