如果这当中有一个负数，乘积就会变成负的，如果你对一个负数开根号，你就会得到一个虚数。
If you had one negative number in it, then the product would be a negative number and, if you took a root of that, then you might get an imaginary number.
单复变量包含实数和虚数两部分，针对两个实值函数n(x) 和v(x)的表达式为：b(x) = n(x) +iv(x)。
fullprof A complex variable has real and imaginary parts written in the form b(x) = n(x) + iv(x) for two real-valued functions n(x) and v(x)
量子理论的数学公式需要运用虚数。
The mathematical formulation of the quantum theory has required the use of imaginary numbers.
虚数字面值是复数型常量的虚数部分的十进制表示。
An imaginary literal is a decimal representation of the imaginary part of a complex constant.
磁头磁阻的计算中，分别就磁芯材料的磁导率为实数和虚数的情况进行了讨论。
The calculation of head reluctance deals with two conditions in which the core material permeability is real or complex.
考察具有一对共轭纯虚数特征值的二维非线性临界解析动态系统的局部渐近稳定性。
The locally asymptotic stability of a 2-dimension nonlinear analytic dynamic system with a pair of conjugated imaginary eigenvalues is studied.
四元数一实数和一矢量的和的表达式，有四个项，一个为实数项，另外三个为虚数项。
An expression that is the sum of a real number and a vector and that contains four terms, one real and three imaginary.
当夏洛特·霍布斯决定教她11岁的学生用来计算负数平方根的虚数时，她知道这是一个艰巨的任务。
WHEN Charlotte Hobbs decided to teach her 11-year-old pupil about the "imaginary" maths needed to work out the square root of a negative number, she knew it would be a stretch.
当夏洛特·霍布斯决定教她11岁的学生用来计算负数平方根的虚数时，她知道这是一个艰巨的任务。
WHEN Charlotte Hobbs decided to teach her 11-year-old pupil about the "imaginary" maths needed to work out the square root of a negative number, she knew it would be a stretch.
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