1650s, "square," with -ic + obsolete quadrate "a square; a group of four things" (late 14c.), from Latin quadratum, noun use of neuter adjective quadratus "square, squared," past participle of quadrare "to square, set in order, complete" (see quadrant). Quadratic equations (1660s) so called because they involve the square of x.
中文解释
1. so called because they involve the square of x.2. 由正方形面积所表示的平方而引申出的这个含义。
实用例句
1. Every function whose derivative is linear is a quadratic function.
任意一个导数为线性函数的函数都是二次函数.
来自辞典例句
2. This is usually a much stronger requirement than quadratic integrability.
这通常是一个比平方可积更强的要求.
来自辞典例句
3. The quadratic aperture of the cat's - eye diaphragm is imaged too large.