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词汇 Sqrt
分类 英语词汇 英语翻译词典
释义

Sqrt

中文百科

平方根 Square root

(重定向自Sqrt)
北宋贾宪增乘开平方法

在数学中,一个数x平方根y指的是满足y^2 = x的数,即平方结果等于x的数。

任意非负实数都有一非负的平方根,称为算术平方根,记为\sqrt x。正数有两个互为相反数的平方根\sqrt x-\sqrt x\sqrt 0是0的唯一平方根。

负数的平方根在复数系中有定义。而实际上,对任何定义了开平方运算的数学对象都可考虑其“平方根”(例如矩阵的平方根)。

英语百科

Square root 平方根

(重定向自Sqrt)
The mathematical expression
The graph of the function f(x) = √x, made up of half a parabola with a vertical directrix.
First leaf of the complex square rootSecond leaf of the complex square rootUsing the Riemann surface of the square root, it is shown how the two leaves fit together

In mathematics, a square root of a number a is a number y such that y = a, in other words, a number y whose square (the result of multiplying the number by itself, or y × y) is a. For example, 4 and −4 are square roots of 16 because 4 = (−4) = 16.

Every non-negative real number a has a unique non-negative square root, called the principal square root, which is denoted by a, where √ is called the radical sign or radix. For example, the principal square root of 9 is 3, denoted 9 = 3, because 3 = 3 × 3 = 9 and 3 is non-negative. The term whose root is being considered is known as the radicand. The radicand is the number or expression underneath the radical sign, in this example 9.

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