单词	imaginary number
释义	Imaginary Number A number that when squared gives a negative result. When we square a Real Number (multiply it by itself) we always get a positive, or zero, result. For example 2×2=4, and (−2)×(−2)=4 as well. So how can we square a number and get a negative result? Because we "imagine" that we can. The "unit" imaginary numbers (the same as "1" for Real Numbers) is √(−1) (the square root of minus one), and its symbol is i, or j. See: Real Number
随便看	cluster coaxial codomain coefficient coincident collateral collinear column column addition column graph combination commission common denominator common difference common factor common fraction common logarithm common multiple common ratio commutative law compass compass (drawing) compass points complement (probability) complement (set)

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